Ron’s Window Washing Service is a small business that operates in the perfectly competitive residential window washing industry in Evanston, Illinois. The short-run total cost of production is STC(Q)=40+10Q+0.1Q2, where Q is the number of windows washed per day. The corresponding short-run marginal cost function is SMC(Q)=10+0.2Q. The prevailing market price is $20 per window.
a. How many windows should Ron wash to maximize the profit?
b. What is Ron's maximum daily profit?
c. What is Ron's short-run supply curve, assuming that all of the $40 per day fixed costs are sunk?

Milden company has an exclusive franchise to purchase a product from the manufacturer and distribute it on the retail level. as an aid in planning, the company has decided to start using a contribution format income statement. to have data to prepare such a statement, the company has analyzed its expenses and has developed the following cost formulas: cost cost formula cost of good sold $35 per unit sold advertising expense $210,000 per quarter sales commissions 6% of sales shipping expense ? administrative salaries $145,000 per quarter insurance expense $9,000 per quarter depreciation expense $76,000 per quarter management has concluded that shipping expense is a mixed cost, containing both variable and fixed cost elements. units sold and the related shipping expense over the last eight quarters follow: quarter units sold shipping expense year 1: first 10,000 $ 119,000 second 16,000 $ 175,000 third 18,000 $ 190,000 fourth 15,000 $ 164,000 year 2: first 11,000 $ 130,000 second 17,000 $ 185,000 third 20,000 $ 210,000 fourth 13,000 $ 147,000 milden company’s president would like a cost formula derived for shipping expense so that a budgeted contribution format income statement can be prepared for the next quarter. required: 1. using the high-low method, estimate a cost formula for shipping expe