Question

Your friend Sarah invests $2000 in an account when she starts college that pays 6.5% annual interest. How much will be in your friend's account after her graduation in 4 years?

Answer 1

assuming simple interest.

$\bf ~~~~~~ \textit{Simple Interest Earned Amount} \\\\ A=P(1+rt)\qquad \begin{cases} A=\textit{accumulated amount}\\ P=\textit{original amount deposited}\dotfill & \ 2000\\ r=rate\to 6.5\%\to \frac{6.5}{100}\dotfill &0.065\\ t=years\dotfill &4 \end{cases} \\\\\\ A=2000[1+(0.065)(4)]\implies A=2000(1.26)\implies A=2520$