Question

percent (5.3)
practice a
solve each percent problem.
the # = % · of # or part = % · whole. the percent is in decimal form.

1. what is 64% of 50?
2. what is 15% of 80?
3. 14 is 35% of what number?
4. what percent of 96 is 12?

calculate the simple interest earned.
i = p·r·t, where i is the interest, p is principal, r is the rate and t is the time in years.

1. how much interest is earned for a $6500 investment at 5% for 10 years?
2. how much interest is earned for a $300 investment at 2.4% for 6 years?

convert as indicated.
to change a fraction to a percent first divide, then multiply by 100%. always reduce if possible.

1. change to a fraction : 38%
2. change to a percent : 13/40

Explanation:

Problem 1: What is 64% of 50?

Step1: Convert percent to decimal

64% = 0.64

Step2: Multiply by the whole number

0.64 * 50 = 32

Step1: Convert percent to decimal

15% = 0.15

Step2: Multiply by the whole number

0.15 * 80 = 12

Step1: Convert percent to decimal

35% = 0.35

Step2: Divide part by percent

14 / 0.35 = 40

Answer:

32

Problem 2: What is 15% of 80?