Mo is buying valentine's day cards for the class. There are 30 students and he wants to give a Valentine to 60% of them. They cost $2 each. If he has $40, what percentage of his money will he spend on Valentine?
He needs 18 valentine's cards because 30 x .6 = <T>multiply(30, 0.6)=18.0
He will spend $36 on these because 18 x 2 = <T>multiply(18, 2)=36
The proportion of his income spent is .9 because 36 / 40 = <T>divide(36, 40)=0.9
This is 90% of his income because .9 x 100 = <T>multiply(0.9, 100)=90.0
