Need help on this script

[Ragnar Lothbrok]

How to add chances or percent to recieved the badge like 40%chances if player kill a player?

 

 

- script BattleBadge -1,{
OnPCKillEvent:
if (killedrid == getcharid(3)) end;
for(set .@i,0; .@i<.size; set .@i,.@i+1)
if (strcharinfo(3)==.maps$[.@i]) {
getitem .items[rand(getarraysize(.items))],1; break; }
end;
OnInit:
setarray .maps$[0],"pvp_y_1-2","pvp_y_2-2","pvp_y_3-2";
setarray .items[0],7828,7829,7773;
set .size, getarraysize(.maps$);
end;
}

[Emistry]

if (killedrid == getcharid(3) || rand(100) > 40 ) end;