The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 450 g?
- How much is the postage if a parcel has a mass of 2.1 kg?
(a)
Postage cost of the parcel with a mass of 450 g
= 2.40 + 0.30
= $2.70
(b)
1 kg = 1000 g
2.1 kg = 2.1 x 1000 = 2100 g
Cost for first 400 g = $2.40
Remaining mass
= 2100 - 400
= 1700 g
Number of sets of 50 g
= 1700 ÷ 50
= 34
Cost for remaining 1700 g
= 34 x 0.30
= $10.20
Postage cost of the parcel with a mass of 2.1 kg
= 10.20 + 2.40
= $12.60
Answer(s): (a) $2.70 (b) $12.60