TFS 0.X TASK % EXP of Kill

[OTcreator]

Hello.
How I Can change exp value to % of kill exp?
ETC - I KILL 100 trolls ---> reward: 20% of 100 kill trolls experience?

local tasks =
{
    [1] = {questStarted = 1510, questStorage = 65000, killsRequired = 70, raceName = "Trolls", rewards = {{enable = true, type = "exp", values = *20% of kill monsters*}, {enable = true, type = "money", values = 1500}}}
}
 
local rankStorage = 32150
local storage = 64521
 
local keywordHandler = KeywordHandler:new()
local npcHandler = NpcHandler:new(keywordHandler)
NpcSystem.parseParameters(npcHandler)
local talkState = {}
local voc = {}
 
function onCreatureAppear(cid)                          npcHandler:onCreatureAppear(cid) end
function onCreatureDisappear(cid)                       npcHandler:onCreatureDisappear(cid) end
function onCreatureSay(cid, type, msg)                  npcHandler:onCreatureSay(cid, type, msg) end
function onThink()                                      npcHandler:onThink() end
 
function creatureSayCallback(cid, type, msg)
 
    local s = getCreatureStorage(cid, storage)
 
    if(not npcHandler:isFocused(cid)) then
        return false
    end
    local talkUser = NPCHANDLER_CONVBEHAVIOR == CONVERSATION_PRIVATE and 0 or cid
    if msgcontains(msg, "task") then
 
        if(s < 1) then
            doCreatureSetStorage(cid, storage, 1)
            s = getCreatureStorage(cid, storage)
        end
 
        if(getCreatureStorage(cid, rankStorage) < 1) then
            doCreatureSetStorage(cid, rankStorage, 0)
        end
 
        if tasks[s] then
            if(getCreatureStorage(cid, tasks[s].questStarted) < 1) then
                if(getCreatureStorage(cid, tasks[s].creatureStorage) < 0) then
                    doCreatureSetStorage(cid, tasks[s].creatureStorage, 0)
                end
 
                if(getCreatureStorage(cid, tasks[s].questStorage) < 0) then
                    doCreatureSetStorage(cid, tasks[s].questStorage, 0)
                end
 
                doCreatureSetStorage(cid, tasks[s].questStarted, 1)
                selfSay("You have started the task number " .. getPlayerStorageValue(cid, storage) .. ", in this task you need to kill " .. tasks[s].killsRequired .. " " .. tasks[s].raceName .. ".", cid)
            else
                selfSay("You are currently making the task about " .. tasks[s].raceName .. ", task number " .. getPlayerStorageValue(cid, storage) .. "/40.", cid)
            end
        else
            print("[Warning - Error::Killing in the name of::Tasks config] Something is wrong.")
        end
 
    elseif msgcontains(msg, "report") then
        if tasks[s] and tasks[s].questStarted > 0 then
            if(getCreatureStorage(cid, tasks[s].creatureStorage) < 0) then
                doCreatureSetStorage(cid, tasks[s].creatureStorage, 0)
            end
 
            if(getCreatureStorage(cid, tasks[s].questStorage) < 0) then
                doCreatureSetStorage(cid, tasks[s].questStorage, 0)
            end
 
            if(getCreatureStorage(cid, tasks[s].questStorage) >= tasks[s].killsRequired) then
                for i = 1, table.maxn(tasks[s].rewards) do
                    if(tasks[s].rewards[i].enable) then
                        if isInArray({"boss", "teleport", 1}, tasks[s].rewards[i].type) then
                            doTeleportThing(cid, tasks[s].rewards[i].values)
                        elseif isInArray({"exp", "experience", 2}, tasks[s].rewards[i].type) then
                            doPlayerAddExperience(cid, tasks[s].rewards[i].values)
                        elseif isInArray({"item", 3}, tasks[s].rewards[i].type) then
                            doPlayerAddItem(cid, tasks[s].rewards[i].values[1], tasks[s].rewards[i].values[2])
                        elseif isInArray({"money", 4}, tasks[s].rewards[i].type) then
                            doPlayerAddMoney(cid, tasks[s].rewards[i].values)
                        elseif isInArray({"storage", "stor", 5}, tasks[s].rewards[i].type) then
                            doCreatureSetStorage(cid, tasks[s].rewards[i].values[1], tasks[s].rewards[i].values[2])
                        elseif isInArray({"points", "rank", 2}, tasks[s].rewards[i].type) then
                            doCreatureSetStorage(cid, rankStorage, getCreatureStorage(cid, rankStorage) + tasks[s].rewards[i].values)
                        else
                            print("[Warning - Error::Killing in the name of::Tasks config] Bad reward type: " .. tasks[s].rewards[i].type .. ", reward could not be loaded.")
                        end
                    end
                end

        if getPlayerStorageValue(cid, 65051) > 0 then
            selfSay('You have already all task!!', cid)
        end
                local rank = getCreatureStorage(cid, rankStorage)
                selfSay("Great!... you have finished the task number " .. s .. "" .. (rank > 4 and ", you are a " or "") .. "" .. (((rank > 4 and rank < 10) and ("Huntsman") or (rank > 9 and rank < 20) and ("Ranger") or (rank > 19 and rank < 30) and ("Big Game Hunter") or (rank > 29 and rank < 50) and ("Trophy Hunter") or (rank > 49) and ("Elite Hunter")) or "") .. ". Good job.", cid)
                doCreatureSetStorage(cid, storage, s + 1)
            else
                selfSay("Current " .. getCreatureStorage(cid, tasks[s].questStorage) .. " " .. tasks[s].raceName .. " killed, you need to kill " .. tasks[s].killsRequired .. ".", cid)
            end
        else
            selfSay("You do not have started any task.", cid)
        end
    end
    return true
end
 
npcHandler:setCallback(CALLBACK_MESSAGE_DEFAULT, creatureSayCallback)
npcHandler:addModule(FocusModule:new())