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| rev | Admin | (Created page with "Bill and Joe each put 10 into separate accounts at time t = 0, where t is measured in years. Bill’s account earns interest at a constant annual effective interest rate of K/25, K > 0. Joe’s account earns interest at a force of interest, <math>\delta_t = \frac{1}{K + 0.25t}</math> At the end of four years, the amount in each account is X. Calculate X. <ul class="mw-excansopts"><li>20.7</li><li>21.7</li><li>22.7</li><li>23.7</li><li>24.7</li></ul> {{soacopyright |...") | Nov 17'23 at 22:39 | +483 |