1. A $204,700 mortgage with interest rate 4.8% compounded monthly is repaid with monthly payments of $1073.99.
2. A $143,000 mortgage with interest rate 4.5% compounded monthly with monthly payments of $724.56.
3. $25,000 is deposited into a savings account paying 3.9% interest compounded weekly and $100 is withdrawn from the account at the end of each week?
Give a difference equation for yn, the balance after n interest periods.