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According to the condition, the number of rods sold as a function of price "p" is
n(p) = 90 + ,
or, equivalently,
n(p) = 90 + 0.5*(200-p).
The revenue R(p) as the function of price is then the product
R(p) = p*n(p) = p*(90 + 0.5*(200-p) = p*(90 + 100 - 0.5*p) = -0.5p^2 + 190p.
To generate the revenue of 17600 dollars, the price should satisfy this equation
R(p) = 17600 dollars,
or, equivalently
-0.5p^2 + 190p = 17600.
Simplify and solve for p.
p^2 - 380p + 35200 = 0
= = .
ANSWER. There are two solutions: p= 160 and p= 220 dollars.
Solved.