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| rev | Admin | (Created page with "'''Solution: D''' Set up the following two equations in the two unknowns: <math display = "block"> \begin{array}{cc}{{A(1.05)^{2}+B(1.05)^{-2}=6000}}\\ {{2A(1.05)^{1}-2B(1.05)^{-3}=0.}}\end{array} </math> Solving simultaneously gives: <math display = "block"> \begin{array}{l}{{A=2721.09}}\\ {{B=3307.50}}\\ {{|A-B|=586.41}}\end{array} </math> {{soacopyright | 2023 }}") | Nov 20'23 at 19:53 | +373 |