Rewrite the equation as .
Divide each term in by .
Cancel the common factor of .
Cancel the common factor.
Divide by .
Take the natural logarithm of both sides of the equation to remove the variable from the exponent.
Expand by moving outside the logarithm.
Divide each term in by .
Cancel the common factor of .
Cancel the common factor.
Divide by .
Solve for t a=p(1+r)^t