The cost function for a particular product is given by c(x)=0.0001 x^3−0.015x^2+13.1x+120 dollars, where 0≤x≤60. find the minimum marginal cost of the product, rounded to the nearest cent.

The cost function for a particular product is given by C(x)=0.0001 x^3−0.015x^2+13.1x+120 dollars, where 0≤x≤60. Find the minimum marginal cost of the product, rounded to the nearest cent, Would be C= 0.0001x^3−0.015x^2+13.1x+120 / X or C=0.0001x^3−0.015x^2+133.1x

The correct answer will be d. -4