I am stuck on one problem. Please help. Here is the information.

hake Skateboards is considering building a new plant. Here are the figures:

Cost of plant $4,800,000

Annual cash inflow. $4,800,000

Annual Cash outflows $4,248,000

Estimated useful life 15 years

Salvage value $2,400,000

Discount rate 11%

The marketing manger says there has been warranty issues. Overall he believes sales will be $240,000 higher than projected above and savings from improve quality and less warranty/ legal costs will save the company $72,000 a year. He think the project isnt that risky as assumed above and the a 9% rate is more reasonable. I need to compute the net present value using the original estimates but employing the 9% discount rate the marketing manager is suggesting.