I need a full explanation about the solution (step by step).

The home work is :

Problem 1 – Handy-Man Services is a repair-service company specializing in small household jobs. Each client pays a fixed monthly service fee based on the number of rooms in the house. Records are kept on the time and material costs used for each repair. The following profitability data apply to five customers.

Question 1: Compute the operating income for each of the five customers. (five points)

Question 2: What options should Handy-Man Services consider in light of the customer-profitability results? (five points)

Question 3: What problems might Handy-Man Services encounter in accurately estimating the operating costs of each customer? (five points)

Problem 2 – Gavin and Alex, baseball consultants, are in need of a microcomputer network for their staff. They have received three proposals, with related facts as follows:

The company uses straight-line depreciation for all capital assets.

Question 1: Compute the payback period, net present value, and accrual accounting rate of return with initial investment, for each proposal. Use a required rate of return of 14%. (10 points)

Question 2: Rank each proposal 1, 2, and 3 using each method separately. Which proposal is best? Why? (five points)