quack quack inc. buys 2000 units of flappers every year for $ 1800 per flapper. the holding cost per item per year is $ 1200 (flappers are very expensive to hold!) and the cost per order is $400 (but not as expensive to order!). the supplier offers a 2% discount quack quack orders in a minimum lot size of 50 units (they can order more than 50, but not less than 50 in each order to get the price discount). what is the quantity that you would reccommend quack quack to buy in one order?