leizer Chapter 1 Additional Problem: a) Last year, 4 Salespeople working 160 hours per month, sold 5000 item A and 7000 item B for the whole year. Item A sold for $600 each and item B sold for $800 each. This year 3 salespeople working 200 hours per month, sold 4000 item A and 6000 item B. The selling price of each item was 10% higher this year. Find the % change in the productivity of salespersons