Ken's freight forwarding company charges $15 for every picture frame delivered on time and $10 for every picture frame delivered late. In the month of November, Ken's freight forwarding company collected $1575. For every 13 picture frames delivered, 9 were delivered on time and 4 were delivered late.

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

	On time	Late	Total
Number	9 u	4 u
Value	15	10
Total Value	135 u	40 u	175 u

(a)
Total amount collected in November
= 135 u + 40 u
= 175 u

175 u = 1575

1 u = 1575 ÷ 175 = 9

Total number of picture frames delivered on time
= 9 u
= 9 x 9
= 81

(b)
Amount that Ken's freight forwarding company collected less from each late delivery of picture frames
= 15 - 10
= $5

Number of picture frames delivered late
= 4 u 
= 4 x 9
= 36

Amount that Ken's freight forwarding company collected less from all the late deliveries of picture frames 
= 36 x 5
= $180

Answer(s): (a) 81; (b) $180