Knight Petroleum has spent $ 207,000 to refine 64,000 gallons of petroleum distillate, which can be sold for $ 6.10 per gallon. Alternatively, Knight can process the distillate further and produce 56,000 gallons of cleaner fluid. The additional processing will cost $ 1.75 per gallon of distillate. The cleaner fluid can be sold for $9.20 per gallon. To sell cleaner fluid, Knight must pay a sales commission of $0.10. per gallon, and a transportation charge of $ 0.19 per gallon. Should Knight sell the distillate or process further to the cleaner fluid? Prepare a differential analysis to answer this