Answer: $34,980.13
Explanation:
The amount that the company will spend 4 years from now is simply the future value of the amount that it can spend today.
The amount to be spent today is $20,000 so the amount to be spent 4 years from now is the future value of $20,000:
= Amount * (1 + rate) ^ number of years
= 20,000 * ( 1 + 15%)⁴
= $34,980.13