Lol it is 100! Omgee it's 100 ! What's wrong with yu ppl !???? He stole 100$ !!!! After he stole the 100 it don't matter what he bought or came back with!
Let's say you have 200$ in your drawer to begin with, person stole 100$ so that puts your register to 100$ now. He came back bought 70$ worth of things and got 30$ back. Now the register is at 170. If he never stole the 100$ it would be at 270. So 270 what he suppose to have subtract the 170 he actually has=100 !!