The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 550 g?
- How much is the postage if a parcel has a mass of 2.9 kg?
(a)
Cost
= 2.70 + 0.50
= $3.20
(b)
1 kg = 1000 g
2.9 kg = 2.9 x 1000 = 2900 g
Cost for first 450 g = $2.70
Remaining mass
= 2900 - 450
= 2450 g
Number of sets of 100 g
= 2450 ÷ 100
= 24.5
Number of sets of 100 g to pay for
= 24 + 1
= 25
Cost for remaining 2450 g
= 25 x 0.50
= $12.50
Total cost
= 12.50 + 2.70
= $15.20
Answer(s): (a) $3.20; (b) $15.20