Spirit calculated that she would spend $175 on school supplies this year. She actually spent $97.50 on school supplies. What is Spirit's percent of error?

The percent error is given by....

l Approximate Value - Exact Value l / l Exact Value l x 100%

So we have

l 175 - 97.50 l / l 97.50 l x 100% =

77.50 / 97.50 x 100% =

about 79.5%

7$ because 9 plus 10 equals 21 and then i multiplied that by three and by the time i was done i got 7 dollars and 23 cents