For each growth rate below, use the rule of 70 to calculate how long it will take incomes to double. Instructions: Round your answers to one decimal place. Years for incomes to double a. 1.4 percent b. 3.2 percent c. 4.9 percent d. 6.4 percent e. 7.5 percent

Rule 70 is used to estimate how long it tales a cashflow amount to double.

The formula is as follows;

Number of years = 70 / growth rate

At 1.4% growth rate;

Number of years = 70 / 1.4 = 50

At 3.2% growth rate;

Number of years = 70 / 3.2 = 21.88

At 4.9% growth rate;

Number of years = 70 / 4.9 = 14.29

At 6.4% growth rate;

Number of years = 70 / 6.4 = 10.94

At 7.5% growth rate;

Number of years = 70 / 7.5 = 9.33