Rael's freight forwarding company charges $15 for vases delivered on time and $10 for vases delivered late. In the month of March, Rael's freight forwarding company collected $1680. For every 20 vases delivered, 16 were delivered on time and 4 were delivered late.

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

	On time	Late	Total
Number	16 u	4 u
Value	15	10
Total Value	240 u	40 u	280 u

(a)
Total amount collected in March
= 240 u + 40 u
= 280 u

280 u = 1680

1 u = 1680 ÷ 280 = 6

Total number of vases delivered late
= 4 u
= 4 x 6
= 24

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

Number of vases delivered late
= 4 u 
= 4 x 6
= 24

Amount that Rael's freight forwarding company collected less from all the late deliveries of vases 
= 24 x 5
= $120

Answer(s): (a) 24; (b) $120