so at this point next unit produced will have a higher marginal cost. marginal revenue is similar to marginal cost. marginal revenue is change in total revenue when extra unit of product is sold. if a business sells all of it's goods at market price then the marginal revenue is equal to that of market price
G is the answer because if you set x as the value of B, then x+(x+10)+(x+30)=180 so x=46.67. then you add 10 to that because the value of A is 10 more than B