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

R = (1/t)(A/P - 1)r = (1/9)((300/81) - 1)Reduce the expression by cancelling the common factors.r=(1/9)(100/27−1)Combine 100/27 and −1 using a common denominator.r=(1/9)(100−1⋅27/27)Simplify the numerator.r=(1/9)(73/27)r = 0.30041152converting r decimal to a percentageR = 0.30041152 * 100 = 30.0412%/yearA. 3%
hope this helps

14/42divide both numbers by 2 = 7/21

so 14/42 and 7/21 are proportional because they are equivalent fractions