Question

I want to spend $21 of her $300 on a gift what percent of her paycheck was spent on the gift

Answer 1

percent means parts out of 100
21/300=what%
21/300=x/100
notice we can turn 300 into 100 by dividing by 3, but divide top by 3 as well
7/100=x/100
7=x
answer is 7%