Different designs have been made for the equipment planned to be purchased and the following data has been obtained. Design I Design II Design III Design IV Total capital investment , $ 22 000 24 000 24 500 28 000 Production expenses before tax,$ / Day 20 28 26 24 Fixed expenses before tax, $ / day 5 5 5 5 Annual number of working days of the facility 300 300 300 300 The minimum return rate of the investment after tax is required to be 20%. What design is accepted it should be? (Income tax rate can be accepted as 35%)