Q. 1

Kurt Steinman's computer supply business is growing, and sales over the past 10 months have been as follows.

Month 0 2 3 4 5 6 7 8 9 Demand 3 4 8 10 15 18 20 22 27 28Date Purchases Unit cost Sales Unit price Number Number Opening stock 80 $20 January 20 $30 February 40 $40 March 60 $30 April 50 $50 May 80 $40 June 20 $60