Two married couples of investors are analyzing a project where they acquired the following figures: initial investment $310,000 annual net profit of $130,000 each year for five years; salvage value of assets at the end of the fifth year $160,000. The money contributions for the initial investment were shareholders: 60% MARR 43%, bank A 20%, interest charged by the bank 45%; bank B 20% of the investment and an interest rate for the loan of 49%. Calculate the mixed MARR and determine the economic convenience of the investment by the NPV