You need to get that shit nipped in the bud. Programming in Excel is exactly that - programming. There are many ways to get to the right answer, and it's very hard to call one solution objectively better than another unless you're doing intense performance analysis. Also, the C4*.05+C4 thing is fucking gold, because that's very obviously objectively worse - it's two reads from memory and two mathematical operations as opposed to one read from memory and one mathematical operation. This professor should be fired for gross incompetence.
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