Question

Principal $960 interest rate 9% time in nine months what is the simple interest

Answer 1

keeping in mind that a year has 12 months, thus 9 months is really 9/12 of a year.

`~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\\ P=\textit{original amount deposited}\dotfill & \$960\\ r=rate\to 9\%\to (9)/(100)\dotfill &0.09\\ t=years\to (9)/(12)\dotfill &(3)/(4) \end{cases} \\\\\\ I = (960)(0.09)((3)/(4)) \implies I=64.8`