A new municipal refuse-collection truck can be purchased for Php840,000. Its expected useful life is six years, at which time its market value will be zero. Annual receipts less expenses will be approximately Php180,000 per year over the six-year study period. Determine the acceptability of this proposal using each of the following if the company's MARR is 18%:

A. Present Worth method

B. Discounted Payback method

C. IRR method D.Conventional B-C Ratio method