Here’s how the Rule of 72 works: Divide 72 by your expected annual interest rate (as a percentage, not a decimal). The answer is roughly the number of years it will take for your money to double. For ...
Lower bound: 300,000,000 ÷ 132,216,000 households ≈ $2.27 per household. Upper bound: 1,000,000,000 ÷ 132,216,000 ≈ $7.56 per ...