Dylan's freight forwarding company charges $18 for every plate delivered on time and $15 for every plate delivered late. In the month of October, Dylan's freight forwarding company collected $3159. For every 20 plates delivered, 17 were delivered on time and 3 were delivered late.

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

	On time	Late	Total
Number	17 u	3 u
Value	18	15
Total Value	306 u	45 u	351 u

(a)
Total amount collected in October
= 306 u + 45 u
= 351 u

351 u = 3159

1 u = 3159 ÷ 351 = 9

Total number of plates delivered on time
= 17 u
= 17 x 9
= 153

(b)
Amount that Dylan's freight forwarding company collected less from each late delivery of plates
= 18 - 15
= $3

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

Amount that Dylan's freight forwarding company collected less from all the late deliveries of plates 
= 27 x 3
= $81

Answer(s): (a) 153; (b) $81