Dan Bumblauskas is the owner of a smal lowa company that produces electric knives used to cut fabric. The annual demand is for 6,000 knives, and Dan produces the knives in batches. On averago, Dan can produce 160 knives per day; during the production process, demand has been about 40 knives per day. The cost to set up the production process is $80, and it costs Dan $1.20 to carry a knife for 1 year. How many knives should Dan produce in each batch? Dan should produce knives in each batch (round your response to the nearest wholo number)