I dont understand why for example copier A get 60$ with 1 hr 40 mins, it is supposed to be $30 + (40/60)*30, could anybody please explain this point to me I still do not get it ! many thanks !
guerrero25 wrote:
Three copy machines are making copies of the same document. Copier A makes 12 copies per minute, Copier B makes 7, and Copier C makes 19. It costs 8 cents/copy for Copier A, 5 cents/copy for Copier B, and 11 cents/copy for Copier C. If a separate attendant has to be hired for each copier and be paid $30 per hour (you have to pay $60 if the attendant works for one hour and one minute), which copier alone will be the most efficient choice to make 1,200 copies?
A)Copier A
b)Copier B
c)Copier C
d)A and B
e)A and C
We need to find whether the cost differential per copy is enough to offset the speed differential (because of which the attendant needs to be paid more/less)
Copier A - 8 cents
Copier B - 5 cents
Copier C - 11 cents
For 1200 pages, copier B will cost 3 cents *1200 = $36 less than copier A and copier C will cost $36 more than copier A.
Copier A takes 1200/12 = 100 min i.e. 1 hr 40 mins to print 1200 copies. $60 is paid to attendant.
Copier B takes 1200/7 = 170 min i.e. less than 3 hrs to print 1200 copies. $90 is paid to attendant.
Copier C takes 1200/19 = 63 min i.e. $60 is paid to attendant.
Copier B is the most efficient since it costs $36 less to print but $30 more to pay the attendant so overall, it costs $6 less than copier A. (Copier C is most expensive)
Answer (B)