medium · SAT Math
S = P + Prt The formula above gives the future value S of an investment with principal P at a simple interest rate r over t years. Which of the following expresses r in terms of S, P, and t?
- r = (S - P)/(t)
- r = (S)/(Pt) - P
- r = (S - P)/(Pt)
- r = S - P - Pt
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