Please answer both questions 1 and 2. Thank you!

Applecross Dental Services is investigating expanding its operations by acquiring additional teeth cleaning equipment. The equipment would cost $158,000 and management has estimated that it would result in net cash inflows of $15,200 per year. The equipment would have a 15 -year useful life with an expected salvage value of $15,000. (Ignore income taxes.) Required: 1. Compute the equipment's IRR. (Hint: Use Microsoft Excel to calculate the discount factor(s).) (Do not round intermediate calculations and round your final answer to 1 decimal place.) 2.a. Assume that instead of $15,200, the salvage value in 15 years for the new equipment will be $0. Compute the IRR under this new assumption. (Do not round intermediate calculations and round your final answer to 1 decimal place.)