please show formula and calculation do not use excel.

thank you!

Old Main is a historic campus landmark that needs maintenance and repairs to its bell tower every 15 years. Each time the maintenance and repairs are completed, this costs $850.000. The university is seeking a donor to establish an endowment that will pay for all the Old Main bell tower repair and maintenance costs. How large of a charitable gift should the University pursue, assuming the donor's gift is invested in a fund that earns 496 compounded annually? Click here to access the TVM Factor Table calculator. Carry all interim calculations to 5 decimal places and then round your final answer to a whole number. The tolerance is $7,000