I was looking at the answer for Why P=MC instead of MR=MC? The willingness of the customer to pay should decrease with each additional unit because of the law of diminishing returns, which makes me think it should be MR=MC in equilibrium.
TR = P*Q = 400Q-4Q^2.
MR = dTR/dQ = 400-8Q.
400-8Q=140.
260=8Q.
Q = 32.5 units.

P = 400 - 4Q
= 400 - 4*32.5
= 400 - 130
= $270

Maybe I don't know when to use price instead of marginal revenue. What am I missing?

Acar manufacturer uses new machines that automatically assemble an engine from parts fed to the system. the machine can regulate the speed ofassembly depending on the number of parts produced. which type of technology does this machine use? angenoem mense wat ons in matin en esta va ser elthe machine uses

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Lusk corporation produces and sells 14,300 units of product x each month. the selling price of product x is $25 per unit, and variable expenses are $19 per unit. a study has been made concerning whether product x should be discontinued. the study shows that $72,000 of the $102,000 in monthly fixed expenses charged to product x would not be avoidable even if the product was discontinued. if product x is discontinued, the annual financial advantage (disadvantage) for the company of eliminating this product should be: