User:kevinthenerd/boxofsand

$PV\; =\; \backslash sum\_\{k=1\}^\{n\}\; \backslash frac\{C\}\{(1+i)^\{k\}\}\; =\; C\backslash left[\backslash frac\{1-(1+i)^\{-n\}\}\{i\}\backslash right]$