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 Mad Science—Percentages 

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1. What is 25% of 228?

0.57 5.7 57 5,700

2. What is 40% of 750?

30 300 3,000 30,000

3. The sales tax on an item is $100. The sales tax rate is 5%. What is the purchase price (before tax)?

$5.00 $105 $500 $2,000

4. During a sale, a dress decreased in price from $90 to $72. What was the percent of decrease?

20% 80% 120% 125%

5. An investment increases in value from $200 to $216. What is the percent increase?

8% 16% 32% 34.56%

6. A pinball machine that normall sells for $3,999 is on sale for $3,150. What is the rate of discount?

$849 21.2% 98.5% 101.6%

7. Bluebeard has a balance of $1,834.90 on a credit card with an annual percentage rate of 22.4%. This month's minimum payment is $36.70. How much less than this minimum payment is the interest? (In other words, if he only pays the minimum payment, how much goes "past" the interest to pay off his principal?)

$2.45 $3.74 $4.40 $32.59

8. Find the simple interest for a 2 year loan of $8,000 at a simple interest rate of 12%.

$192 $230.40 $960 $1,920

9. Find the simple interest for a 2 month loan of $8,000 at a simple interest rate of 9.42%.

$62.80 $125.60 $753.60 $1,507.20

10. A store takes out a ninety day loan for $6,500 at 5.25% simple interest. What is the total amount due after ninety days?

$84.14 $341.25 $6,584.14 $6,841.25