MC=40P

MR=1000-10P
Solve for P

40P=1000-10P=
50P=1000
P=20
???

looks right to me.

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To solve for P, we need to solve the equation 40P = 1000 - 10P.

To do this, we want to isolate the variable P on one side of the equation.

First, let's combine like terms by adding 10P to both sides of the equation:

40P + 10P = 1000 - 10P + 10P

This simplifies to:

50P = 1000

Now, to isolate P, we need to divide both sides of the equation by 50:

(50P) / 50 = 1000 / 50

P = 20

Therefore, the value of P that solves the equation is P = 20.