All-Leather is a tanning company in Chicago. Its total cost function is C(QA) = 25 + 10QA + 4QA2, where QA is leather production per week in...

 All-Leather is a tanning company in Chicago. Its total cost function is  

C(QA) = 25 + 10QA + 4QA2, where QA is leather production per week in thousands of pounds. 

a) What is the formula for All-Leather's marginal cost function?  

b) If leather sells for $1190 per thousand pounds, how much leather will All-Leather produce? 

c) How much profit will All-Leather make