The tables show that a monthly mortgage payment, R, is a function of the amount financed, A, in thousands of dollars; the duration of the loan, n, in years; and the annual interest rate, r, as a percent. If R = f (A, n, r), use the tables to find the following, and then write a sentence of explanation for each.
(a) f (90, 20, 8)
(b) f (160, 15, 9)

9% Annual Percent Rate
Monthly Payments (Principal and Interest)

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8% Annual Percent Rate Monthly Payments (Principal and Interest) 15 Amount 10 20 25 30 Financed Years Years Years Years Years $50,000 $606.64 $477.83 $418.22 $385.91 $366.88 60,000 70,000 80,000 90,000 1091.95 860.09 752.80 694.63 660.39 100,000 1213.28 955.65 836.44 771.82 733.76 120,000 1455.94 1146.78 1003.72 926.18 140,000 1698.58 1337.92 1171.02 1080.54 1027.28 160,000 1941.24 1529.04 1338.30 1234.90 1174.02 180,000 200,000 2426.56 1911.30 1672.88 1543.64 1467.52 727.97 573.39 501.86 463.09 440.26 849.29 668.96 585.51 540.27 513.64 970.62 764.52 669.15 617.45 587.01 880.52 2183.90 1720.18 1505.60 1389.26 1320.78 Amount 10 15 20 25 30 Financed Years Years Years Years Years $50,000 60,000 70,000 80,000 90,000 100,000 120,000 140,000 160,000 2026.82 1622.82 1439.56 1342.72 1287.40 180,000 2280.16 1825.68 1619.50 1510.56 1448.32 200,000 $633.38 $507.13 $449.86 $419.60 $402.31 760.05 608.56 539.84 503.52 482.77 886.73 709.99 629.81 587.44 563.24 1013.41 811.41 719.78 671.36 643.70 1140.08 912.84 809.75 755.28 724.16 1266.76 1014.27 899.73 839.20 804.62 1520.10 1217.12 1079.68 1007.04 965.54 1773.46 1419.96 1259.62 1174.88 1126.48 2533.52 2028.54 1799.46 1678.40 1609.24