Will's freight forwarding company charges $15 for mirrors delivered on time and $12 for mirrors delivered late. In the month of December, Will's freight forwarding company collected $924. For every 16 mirrors delivered, 13 were delivered on time and 3 were delivered late.

1. What was the total number of mirrors delivered late?
2. How much less money did Will's freight forwarding company collect in December due to the late deliveries of the mirrors?

	On time	Late	Total
Number	13 u	3 u
Value	15	12
Total Value	195 u	36 u	231 u

(a)
Total amount collected in December
= 195 u + 36 u
= 231 u

231 u = 924

1 u = 924 ÷ 231 = 4

Total number of mirrors delivered late
= 3 u
= 3 x 4
= 12

(b)
Amount that Will's freight forwarding company collected less from each late delivery of mirrors
= 15 - 12
= $3

Number of mirrors delivered late
= 3 u 
= 3 x 4
= 12

Amount that Will's freight forwarding company collected less from all the late deliveries of mirrors 
= 12 x 3
= $36

Answer(s): (a) 12; (b) $36