Better Mousetraps has developed a new trap. It can go into production for an initial investment in equipment of $6 million. The equipment will be depreciated straight-line over 6 years but in fact, it can be sold after 6 years for $500,000. The firm believes that working capital at each date must be maintained at a level of 10% of next years forecast sales. The firm estimates production costs equal to $1.50 per trap and believes that the traps can be sold for $4 each. Sales forecasts are given in the following table. The project will come to an end in 6 years when the trap becomes technologically obsolete. The firms tax bracket is 40%, and the required rate of return on the project is 12%.

Year:	0	1	2	3	4	5	6	Thereafter
Sales (millions of traps)	0.00	0.50	0.60	1.00	1.00	0.60	0.20	0

a. What is project NPV?

b. By how much would NPV increase if the firm uses double-declining balance depreciation with a later switch to straight-line when remaining project life is only two years?