How can we go from the given function (6000-9Q)/50 to end up with (120-18Q)/50?
Please write full answer, also if there are any rules used etc I would appreciate an explanation.
Thanks in advance!
This is NOT a matter of mathematics. We can't go from "MC(Q)"" to "MR(Q)" without knowing relationship between MC and the other quantities you give and MR. In other words, the formulas to be used are from economics, not mathematics.