5.3 ho this tund worth today Calculating Rates of Return You've been offered an investment that will double your money in 10 years. What rate of return are you being offered? Check your answer using the Rule or 72 Calculating the Number of Periods You've been offered an investment that will pay you 9 percent per year. If you Invest $15.000, how long until you have $30,000? How long until you have $45,000? 5.4