Your Firm Deals Strictly with Four Customers

Your firm deals strictly with four customers. The average amount each customer pays per month along with the collection delay associated with each payment is shown below. Given this information, what is the weighted average delay? Assume that every month has 30 days.

A) 1.89 days
B) 2.13 days
C) 3.55 days
D) 3.75 days
E) 4.00 days