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7 votes
Sunny made a deposit into an account that

earns 6% simple interest. After 7 years, Sunny
had earned $420. How much was his initial
deposit?

User Ianmclaury
by
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1 Answer

9 votes


~~~~~~ \textit{Simple Interest Earned} \\\\ I = Prt\qquad \begin{cases} I=\textit{interest earned}\dotfill & \$420\\ P=\textit{original amount deposited}\\ r=rate\to 6\%\to (6)/(100)\dotfill &0.06\\ t=years\dotfill &7 \end{cases} \\\\\\ 420 = (P)(0.06)(7)\implies \cfrac{420}{(0.06)(7)}=P\implies 1000=P

User Tkalve
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