Real interest rate formula ap macro
Free AP Macroeconomics practice problem - Real Interest Rate. Includes score reports and progress tracking. Create a free account today. Question #35400. AP Macroeconomics Formula Sheet: 1. Rule of 70: Used to determine how many years it takes for a value to double, given a particular annual growth rate. For example, if you put $20,000 in the bank and it earns yearly interest of 7%, then it will take 10 years (70/7) for your income to double.