Michael's freight forwarding company charges $12 for every picture frame delivered on time and $7 for every picture frame delivered late. In the month of December, Michael's freight forwarding company collected $860. For every 16 picture frames delivered, 12 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 Michael's freight forwarding company collect in December due to the late deliveries of the picture frames?

	On time	Late	Total
Number	12 u	4 u
Value	12	7
Total Value	144 u	28 u	172 u

(a)
Total amount collected in December
= 144 u + 28 u
= 172 u

172 u = 860

1 u = 860 ÷ 172 = 5

Total number of picture frames delivered on time
= 12 u
= 12 x 5
= 60

(b)
Amount that Michael's freight forwarding company collected less from each late delivery of picture frames
= 12 - 7
= $5

Number of picture frames delivered late
= 4 u 
= 4 x 5
= 20

Amount that Michael's freight forwarding company collected less from all the late deliveries of picture frames 
= 20 x 5
= $100

Answer(s): (a) 60; (b) $100