The rule of 70 can be stated as follows: A variable with a growth rate of X percent per year:.a. doubles every 70/X years. b. doubles every 70(1 - 1/X) years. c. doubles every 70/X2 years. d. doubles every 70/(1 - X) years.

a. doubles every 70/X years.

Explanation:

The rule of 70 calculates the amount of years it takes for an investment to double given its growth rate.

for example, an investment has a growth rate of 7%, the amount of years it would take the investment to double is 70 / 7% = 10 years

you will have $2593.74 in 10 years if you set aside $1,000 at 10%

you will have $9321.91 in 20 years if you set aside $2000 at 8%

you will have $1469.32 in 5 years if you set aside $1000 at 8%

you will have $1296.87 in 10 years if you set aside $500 at 10%

you will have $239.66 in 15 years if you set aside $100 at 6%

you will have $4660.96 in 20 years if you set aside $1000 at 8%

the answer is account d