12. What is an expression of equivalent present value P set up of the following cash flow table? Compute the value of P. 14 5 6 Year 7 8 Cash Flow P 1,000 1,150 1,300 1,450 1,600 1,600 1,600 1,600 13. The annual benefits of $4,000 every year for five years may be obtained for an investment on a production equipment costing $20,000 with a salvage value of $5.000. If interest rate is 8%, what is an equation to determine the net present worth (NPW). 14. One of your firm's suppliers discounts prices for larger quantities. The first 1000 parts are $13 each. The next 2000 are $12 each. All parts in excess of 3000 cost $11 each. What is the marginal cost per part for 2001 quantities