a.) Chang Industries has 1,900 defective units of product that have already cost $13.90 each to produce. A salvage company will purchase the defective units as they are for $4.90 each. Chang's production manager reports that the defects can be corrected for $6.10 per unit, enabling them to be sold at their regular market price of $20.80. The incremental income or loss on reworking the units is:

$18,620 income.

$30,210 income.

$27,930 income.

b.) Poe Company is considering the purchase of new equipment costing $85,500. The projected net cash flows are $40,500 for the first two years and $35,500 for years three and four. The revenue is to be received at the end of each year. The machine has a useful life of 4 years and no salvage value. Poe requires a 10% return on its investments. The present value of an annuity of 1 and present value of an annuity for different periods is presented below. Compute the net present value of the machine.

Periods	Present Value of 1 at 10%	Present Value of anAnnuity of 1 at 10%
1	0.9091	0.9091
2	0.8264	1.7355
3	0.7513	2.4869
4	0.6830	3.1699

$(27,665).

$(14,857).

$27,665.

$35,709.