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The Grewals agreed to monthly payments on a mortgage of $363,000.00 amortized over 20 years. Interest for the first five years was 4.3% compounded semi-annually. a. Determine the Grewals' monthly payments. b. Determine the balance owing after the 5-year term. C. Before renewing for another term of 5 years at 4.5% compounded semiannually, the Grewals make an additional payment of $12,000. If they keep the same monthly payments, by how much will the amortization period be shortened? The Grewals agreed to monthly payments on a mortgage of $363,000.00 amortized over 20 years. Interest for the first five years was 4.3% compounded semi-annually. a. Determine the Grewals' monthly payments. b. Determine the balance owing after the 5-year term. C. Before renewing for another term of 5 years at 4.5% compounded semiannually, the Grewals make an additional payment of $12,000. If they keep the same monthly payments, by how much will the amortization period be shortened