Question Number 61526 by Jarbas last updated on 04/Jun/19
![Solve for n: D/A×{1−((P×((((1+i)^n ×i)/((1+i)^n −1))))/((P×((((1+i)^r ×i)/((1+i)^r −1))))−(R/i)×[((1/n)+i)×((((1+i)^r ×i)/((1+i)^r −1)))−((1/n)+i)×((((1+i)^n ×i)/((1+i)^n −1)))]))}−1=0](https://www.tinkutara.com/question/Q61526.png)
$${Solve}\:{for}\:{n}:\:{D}/{A}×\left\{\mathrm{1}−\frac{{P}×\left(\frac{\left(\mathrm{1}+{i}\right)^{{n}} ×{i}}{\left(\mathrm{1}+{i}\right)^{{n}} −\mathrm{1}}\right)}{\left({P}×\left(\frac{\left(\mathrm{1}+{i}\right)^{{r}} ×{i}}{\left(\mathrm{1}+{i}\right)^{{r}} −\mathrm{1}}\right)\right)−\frac{{R}}{{i}}×\left[\left(\frac{\mathrm{1}}{{n}}+{i}\right)×\left(\frac{\left(\mathrm{1}+{i}\right)^{{r}} ×{i}}{\left(\mathrm{1}+{i}\right)^{{r}} −\mathrm{1}}\right)−\left(\frac{\mathrm{1}}{{n}}+{i}\right)×\left(\frac{\left(\mathrm{1}+{i}\right)^{{n}} ×{i}}{\left(\mathrm{1}+{i}\right)^{{n}} −\mathrm{1}}\right)\right]}\right\}−\mathrm{1}=\mathrm{0} \\ $$$$ \\ $$