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Need to get some help please

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S=P(1+rt)

start by dividing by p on both sides


\begin{gathered} (S)/(P)=(P)/(P)(1+rt) \\ (S)/(P)=1+rt \end{gathered}

substract 1 on both sides


\begin{gathered} (S)/(P)-1=1+rt-1 \\ (S)/(P)-1=rt \end{gathered}

Divide by t on both sides to solve for r


\begin{gathered} ((S)/(P)-1)((1)/(t))=(rt)/(t) \\ (S)/(Pt)-(1)/(t)=r \end{gathered}

ANSWER


r=(S)/(Pt)-(1)/(t)

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