Calculate yield in bushels/acre?

A farmer in Saskatchewan harvested 1 Section (which is 640 acres) of wheat and 2 sections of barley. The total yield of grain for both areas was 99 840 bushels. The wheat sold for $ 6.35 /bushel and the barely sold for $ 2.70/bushel. The farmer received $ 363 008 for both crops.
(a) What was the yield of each section in bushels/acre?
(b)Some farmers use hectares instead of acres or sections to measure area. One acres is 0.4047 ha. Would you have to write and solve a different linear system to determine the yield in bushels/hectare? Explain.