Equation of compound interest:

Here   A is the current amount.

P is the principal or initial amount.

r is the annual interest rate expressed as a decimal, r > 0.

n is the number of times the interest is compounded each year, and t is time in years.

             (Substitute )

     (Divide: )

           (Add: )

               (Multiply: )

(Use exponent calculator:)

.                         (Multiply: )

There will be about $ in 7 years.

There will be about $  in 7 years.