Answer :
She would have payed $63 How I figured this is by multiply $90 by 30, and then divide it by 100, that is 27. And then you just do 90-27, and that is 63.
100-30=70
find 70% of 90
70% of 90=7/10 times 90=630/10=63
she paied $63
find 70% of 90
70% of 90=7/10 times 90=630/10=63
she paied $63