Using the rule of 72, approximate the following amounts: a) If land in an area is increasing 8% a year, how long will it take for property values to double? (Round your answer to 1 decimal place.) Time period years b) If you earn 12 percent on your investments, how long will it take for your money to double? (Round your answer to 1 decimal pla- Time period years At an annual interest rate of 5 percent, how long will it take for your savings to double? (Round your answer to 1 decimal place.) Time period years