Question 386828
{{{48 = 83(1-r)^8}}}---->{{{48/83 = (1-r)^8}}} ---->{{{root(8,48/83) = 1-r}}} --->{{{r = 1 - root(8,48/83) = 0.0662}}}, to 4 decimal places.  Therefore the monthly rate of change in the value of the stock is 6.62%.