The Camino Real Landfill was required to install a plastic liner to prevent leachate from migrating into the groundwater. The fill area was 50,000 m2 and the installed liner cost was $8 per square meter. In order to recover the investment, the owner charged

$10 for pick-up loads, $25 for dump truck loads, and $70 for compactor-truck loads. The annual distribution is 2400 pick-up loads, 600 dump truck loads, and 1200 compactor-truck loads. What rate of return will the landfill owner make on the investment if the fill area is adequate for 4 years?