A computer factory produces 6048 computers per month at a constant rate, how many computers are built every 30 minutes assuming that there are 28 days in one month?  Choose the correct choice from the following options
A) 2.25 . B) 3.125 . C) 4.5 . D) 5.225 . E) 6.25 .

Rationale: "number of hours in 28 days = 28 * 24 number of 30 mins in 28 days = 28 * 24 * 2 number of computers built every 30 mins = 6048 / ( 28 * 24 * 2 ) = 4.5 answer c"
Answer: C