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22 March, 08:20

Change the subject of the formula S = P (1 + rt) to t.

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  1. 22 March, 10:16
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    If we're changing the subject to t, we want to get t on it's own.

    S = P (1 + rt)

    Since we can't do anything with the parenthesis, we have to start with the division/multiplication. Divide both sides by P:

    S = 1 + rt

    P

    Next we want to get rid of the 1, so subtract 1 from both sides:

    S - 1 = rt

    P

    finally, divide both sides by r

    (S/P) - 1 = t

    r

    so:

    t = (S/P) - 1

    r
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