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Suppose you invest $100 at a compound interest rate of 10%. The rule of 72 tells you that your money will double every seven years, approximately: If you graph these points, you start to see the familiar compound interest curve:
Yes, you should. Double glazing is an investment of money, and a very good one at that. You can calculate an approximate Return On Investment (ROI). Calculate how much you receive in savings as a percentage of the extra you paid. If your cost was $5,000, and your savings were $ 1,000 per year, your ROI would be 20%.he EXTRA $ 5,000 will cost you an extra $ 28.19 per month to repay. Thatâs only $ 338 a year. Depending on your building envelope double glazing can reduce your heating and cooling costs by up to 50%.