Please provide explanation.

A purchaser pays 750,000 for a min which will be exhausted at the end of 25 years. Find the required level annual revenue (received at the end of each year) in order for the purchaser to receive a 7% annual return on her investment if she can recover her principal in a sinking fund earning 4% per year. (A) 63, 421 (B) 64, 358 (C) 69, 426 (D) 69, 816 (E) 70, 509