Name: SAT Math Help & School Math Mastery
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#14377

equations

formulas

medium

30 sec

The formula for the total amount $A$ accumulated after investing a principal $P$ at an annual interest rate $r$ for $t$ years with simple interest is $A = P (1 + r t)$ . Which of the following correctly expresses the interest rate $r$ in terms of $A$ , $P$ , and $t$ ?

A.

$r = \frac{A - P}{t}$

B.

$r = \frac{A}{Pt} - 1$

C.

$r = \frac{A - P}{Pt}$

D.

$r = A - P - t$