Zeph's freight forwarding company charges $12 for plates delivered on time and $9 for plates delivered late. In the month of July, Zeph's freight forwarding company collected $945. For every 12 plates delivered, 9 were delivered on time and 3 were delivered late.

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

	On time	Late	Total
Number	9 u	3 u
Value	12	9
Total Value	108 u	27 u	135 u

(a)
Total amount collected in July
= 108 u + 27 u
= 135 u

135 u = 945

1 u = 945 ÷ 135 = 7

Total number of plates delivered late
= 3 u
= 3 x 7
= 21

(b)
Amount that Zeph's freight forwarding company collected less from each late delivery of plates
= 12 - 9
= $3

Number of plates delivered late
= 3 u 
= 3 x 7
= 21

Amount that Zeph's freight forwarding company collected less from all the late deliveries of plates 
= 21 x 3
= $63

Answer(s): (a) 21; (b) $63