Kylie's little brother ate 1/4 of 1/2 of the cake. This means he ate 1/8 of the whole cake, since 1/2 is 0.5 of the whole cake, and that means that to find the fraction of what her brother ate, you must divide 1/4 in half, which is 1/8.
there was only half a cake left over. So if you cut that half into 4ths then he ate a fourth of that half. But there was another half that you would have to cut in half. In short he ate 1/8 of the cake.
6%=0.06 if you want to know how much he paid for the sales taxes you multiply 7.5 by 0.06 7.5 . 0.06= 0.45 7.5+0.45=7.95 8>7.95 Jay have enough money to buy the book