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| rev | Admin | (Created page with "'''Solution: B''' Monthly payment at time t is <math>1000(0.98)^{t-1}</math> Because the loan amount is unknown, the outstanding balance must be calculated prospectively. The value at time 40 months is the present value of payments from time 41 to time 60: <math display = "block"> \begin{array}{c}{{O B_{40}=1000[0.98^{40} v^{1}+\cdots+0.98^{59} v^{20}]}}\\ {{=1000\frac{0.98^{40} v^{1}-0.98^{60} v^{21}}{1-0.98 v}, v=1/(1.0075)}}\\ {{=10000\frac{0.44238-0.25434}{1-0.972...") | Nov 18'23 at 21:55 | +531 |