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| rev | Admin | (Created page with "'''Solution: E''' Let F, C, r, and i have their usual interpretations. The discount is <math></math>and the discount in the coupon at time t is . Then, <math display = "block"> \begin{array}{l}{{194.82=(C i-F r)\nu^{26}}}\\ {{306.69=(C i-F r)\nu^{21}}}\\ 0.63523=\nu^{5}\Longrightarrow\nu=0.91\,324\Longrightarrow i=0.095 \\ (C i-F r)=194.82(1.095)^{26}=2062.53 \\ \mathrm{Discount} = 2062.53a_{\overline{40}|0.095}=21,135. \end{array} </math> {{soacopyright | 2023 }}") | Nov 19'23 at 18:16 | +471 |