Your small business is considering purchasing one of two different computers. Computer A costs $820 today and will increase after-tax revenues by $91 , $254, and $734 over years 1-3 respectively. Computer B costs $690 today and will increase after tax revenues by $451 , $246 , and $89 over years 1-3 respectively. If your firm's financing rate is 12%, what is the cross over rate between these two computers and which should you choose?

a.17.9% ,computer B is the better choice b.17.9% , computer A is the better choice c.13.5%, computer A is the better choice d.15.5% ,computer B is the better choice e.13.5% ,computer B is the better choice