Some banks now have biweekly mortgages (that is, with payments every other week). Compare a 20-year, $100,000

Question:

Some banks now have biweekly mortgages (that is, with payments every other week). Compare a 20-year, $100,000 loan at 8.1% by finding the payment size and the total interest paid over the life of the loan under each of the following conditions.
(a) Payments are monthly, and the rate is 8.1%, compounded monthly.
(b) Payments are biweekly, and the rate is 8.1%, compounded biweekly.