### Percents and Averages

1.  50 percent of ______  = 21

A.  11.5
B.  80
C.  4.2
D.  42

2.  Sales tax in your state is 6.5 %.  If your total purchase came to \$30.00, how much would your sales tax be?

A.  \$ 1.95
B.   19.5 cents
C.  \$ 6.50
D.  \$ 4.00

3.  A big sale is advertising that dresses are 75 % off regular price.  If the pre-sale price is \$50.00, what can you expect the price to be after the 75 percent discount has been applied?

A.  \$37.50
B.  \$25.00
C.  \$12.50
D.  \$ 10.49

4.  Mary is trying to determine the average grade that her math students received on the last exam, which was worth 100 points.  Student A received 70 points, Student B received 95 points, Student C received 52 points, Student D received 88 points and Student F received 90 points.  What is the average grade in Mary's class?

A.  79
B. 197.5
C.  85
D.  74

5.  In Kent's science class, his teacher gives five exams.  Test 1 is worth 15 percent of his grade.  Test 2 is also worth15 percent of the final grade.  Tests 3 and 4 are worth 20 percent each of his grade.  Test 5 is each worth 30 percent.  If Kent scored 70 percent on Test 1; 92 percent on Test 2; 85 percent on Test 3; 62 percent on Test 4; and 100 percent on Test 5, what will the final percentage in the class be based on the averages of his tests?

A.  56 %
B. 78 %
C.  83.7 %
D.  89.2 %