Example

Solving the formula A=P+PrtA = P + Prt for tt

To solve the formula A=P+PrtA = P + Prt for the time tt, follow these algebraic steps:

  1. Write the formula: A=P+PrtA = P + Prt.
  2. Isolate the term containing tt by subtracting PP from both sides: AP=PrtA - P = Prt.
  3. Isolate tt by dividing both sides by PrPr: t = rac{A - P}{Pr}. This rearranged formula allows you to calculate the elapsed time when the final amount, principal, and interest rate are known.

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Updated 2026-04-22

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