Archie's freight forwarding company charges $20 for every mirror delivered on time and $15 for every mirror delivered late. In the month of February, Archie's freight forwarding company collected $3105. For every 18 mirrors delivered, 15 were delivered on time and 3 were delivered late.

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

	On time	Late	Total
Number	15 u	3 u
Value	20	15
Total Value	300 u	45 u	345 u

(a)
Total amount collected in February
= 300 u + 45 u
= 345 u

345 u = 3105

1 u = 3105 ÷ 345 = 9

Total number of mirrors delivered on time
= 15 u
= 15 x 9
= 135

(b)
Amount that Archie's freight forwarding company collected less from each late delivery of mirrors
= 20 - 15
= $5

Number of mirrors delivered late
= 3 u 
= 3 x 9
= 27

Amount that Archie's freight forwarding company collected less from all the late deliveries of mirrors 
= 27 x 5
= $135

Answer(s): (a) 135; (b) $135