The table given below shows how, on average, the market value of a Boeing 737 has varied with its age and the cash flow needed in each year to provide a 13% return. (For example, if you bought a 737 for $20.09 million at the start of year 1 and sold it a year later, your total profit would be 18.19 + 4.51 20.09 = $2.61 million, 13% of the purchase cost.) Assume airlines write off their aircraft straight-line over 15 years to a salvage value equal to 10% of the original cost.

Start of Year	Market Value	Cash Flow
1	20.09
2	18.19	4.51
3	17.19	3.36
4	15.98	3.44
5	15.29	2.77
6	14.29	2.99
7	13.76	2.39
8	12.88	2.67
9	12.45	2.10
10	11.66	2.41
11	11.31	1.87
12	10.59	2.19
13	10.31	1.66
14	9.64	2.01
15	9.41	1.48
16	8.79	1.84

a. Calculate economic depreciation, book depreciation, economic return, and book return for each year of the planes life. (Leave no cells blank - be certain to enter "0" wherever required. Do not round intermediate calculations. Enter your answers in millions except for percentage values. Round your percentage answers to 1 decimal place and other answers to 2 decimal places.)

b-1. Suppose an airline invested in a fixed number of Boeing 737s each year. Calculate the steady-state book rate of return. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.)