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| rev | Admin | (Created page with "'''Solution: B''' Using the retrospective method: <math display = "block"> \begin{array}{c}{{4000(1.05)^{6}-250s_{\overline{6}|0.05}}}\\ {{5360.38-1700.48=3659.90}}\end{array} </math> {{soacopyright | 2023 }}") | Nov 19'23 at 12:32 | +213 |