find the number of units that must be produced to break even.

R(x)=200x - x^2
C(x)= 70x +2200
0 < x < 100 (These < are supposed to b less than or equal to signs)

1 answer

Break even is when R(x) =C(x)

200x - x^2 =70x +2200

0 = x^2 -130x +2200
Factor (x-110)(x-20) = 0
x = 110 or x =20

Given the values of x stated above.
Your only possible answer is 20.