\fFor each growth rate below, [i] use the rule of 70 to calculate how long it will take incomes to double, and (ii) if each countryr starts with an income of $1,000 per capita, use the exponential growth equation to calculate what the income will be in 30 years. Instructions: Round your answers to one decimal place. Years for incomes . Incomes 1n 36 years b. 7 percent c. 2.5 .ercent d. 18 percent