I need assistance with the answer I do not understand the formula or how to use it

How much would $100, growing at 4.7% per year, be worth after 70 years? a. $2,584.04 b. $2,607.44 c xo * C. $2,378.60 d. $2,490.39 e. $2,907.35 How much would $40,000 due in 50 years be worth today if the discount rate were 6.8%? ca. $1,396.13 b. $1,592.46