always happening branch and variable problem

i would like to make an event with an conditinal brach wich always happens, like this:
player buys a house for 1000 gold and rent it out, every 10 minutes he gets 50 gold.
it could be done with a timer and a conditional brach.... but how???
-------------------------------------------------------------------------------------------------------------------------------------------
i want an event to to a certain number x a variable, like this:
how many apples would you like to buy? (they cost 5 each)
input number 4 digits=apples
apples x 5=cost
conditional branch gold=cost or higher
here are your apples sir
change items apples+apples(the variable)
change gold-cost
and so on

fo the apple event it is not for regular items but for items to sell in your player owned shop

the "would you like to buy some apples from me hero" thing, it has to be so the player gets money overtime and lose apples overtime because they are sold automaticly by an npc.

no, when he has no apples it should stil be possible to do 9000 apples

  so that is what the mul is used for, realy thanks, it wil surely help

EDIT:wtf, when i open one of my games it says "unexpected file format" i cant do anything in any of my games (im using rpg maker xp with keygen)

there are no working solutions in there