Your Firm Receives 40 Checks Per Month

Your firm receives 40 checks per month. Of these,10 are for $1,200 and 30 are for $500. The delay for the $1,200 checks is 4 days; the $500 checks are delayed 6 days. What is the weighted average delay?

A) 4 days
B) 4.5 days
C) 5 days
D) 5.5 days
E) 6 days