Answer: $$70,643
Step-by-step explanation:
The payment from the 4th year to the 10th year is an annuity because it is constant.
The present value of an annuity is:
= Annuity * Present value interest factor of annuity, 12%, 7 years
= 14,000 * 4.5638
= $63,893.20
Present value of these:
= 8,000 / 1.12 + 11,000 / 1.12² + 13,000/1.12³ + 63,893.20 / 1.12³
= $70,643