Jacob invested $300 in a savings account and earned $81 in simple interest at the end of 9 years. what was the interest rate a) 3% b) 3.5% c) 4% d) 4.5%

A) 3%

Step-by-step explanation:

I = P(RT)

I = interest

P = principle

r= rate

t = time

81 = 300  r * 9

81 = 2700*r

divide by 2700

81/2700 = r

.03 =r

multiply by 100 to get the percent

3 =r

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3