7. a) If you are to receive 20000 taka after 10 years by depositing 5000 taka today then what is the interested will you earn? b) If your money gets double by earning 8% interest then how long will you need to wait? c) If you are borrowing to buy a laptop by making 500 taka EMI for the next 60 months then how much did you borrow when you paid 12% interest