A BestBuy store sells an average of 100 Playstation 4 (P4) per month. The cost of holding a P4 in inventory for a year is 20% of the price BestBuy pays for the P4. It costs $100 each time placing an order with its supplier. The price charged per P4 depends on the number of P4 ordered (see Table below). Each time BestBuy places an order, how many P4 should be ordered?
No. of P4 Ordered Price per P4
1-10 $200
11-40 $180
more than 41 $150