Raul calculated that he would spend $125 on school supplies this year. he actually spent $87.50 on school supplies. what is raul’s percent of error?
a: 42.9%
b: 37.5%
c: 30%
d: 3%

C - 30%.

We know he spends less than he has expected, so we put it as a fraction calculate the percentage of the error. 

So it would be:

87.5/ 125 = 0.7

And 1-0.7 = 0.3 

When we move the chemical place two places to the left to make it a percentage, it will become 30%.