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Simple Calculus I question

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Originally posted by: unsped
woops here is the right answer i forgot to turn P into TR 😉

(d) 55
when x=50

TR = P*Q
TR = 80x-.5x^2
MR = 80-x

C = 100+30x
MC = 30

set MR = MC

80-x = 30
x = 50 (quanitity)

price = 80-25x = 55
Click to expand...

Yep, the answer should be 55 and now it makes sense to me...
 
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