Mr. Charles owns a private garbage dump. He has been asked that to avoid leaks that contaminate the groundwater, he must install a plastic protector. The landfill area is 7 km2 and the cost of handling the vapors is $ 1,000 per km2 and is paid for all land use. The installation cost of the protector is known to be $ 2,000,000. To recoup the investment in 5 years, Mr. Charles charged $ 50 for the delivery truck loads, $ 100 for the dump truck loads, and $ 200 for the compactor truck loads. It is also known that the monthly distribution has been estimated at 1,000 delivery truck loads, 200 dump truck loads and 500 compactor truck loads.

a) What internal rate of return did Mr. Charles obtain on his investment? to. Effective monthly and Effective annually

b) If the minimum attractive rate of return is 8% annual compound monthly cash for Mr. Charles's businesses, what can you recommend in this regard, support your answers?