I need clear solutions that is easy to follow to get the answers right :) If excel forlumas is used, please show how! Thank you!!

Riverton Mining plans to purchase or lease $435,000 worth of excavation equipment. If purchased, the equipment will be depreciated on a straight-line basis over five years, after which it will be worthless. If leased, the annual lease payments will be $101,169 per year for five years. Assume Riverton's borrowing cost is 7.5%, its tax rate is 30%, and the lease qualifies as a true tax lease.

a.) If Riverton purchases the equipment, what is the amount of the lease-equivalent loan? (Round to the nearest dollar.)

b.) Is Riverton better off leasing the equipment or financing the purchase using the lease-equivalent loan? ("financing the purchase" or "leasing the equipment")

c.) What is the effective after-tax lease borrowing rate? How does this compare to Riverton's actual after-tax borrowing rate?(Round to two decimal places.)