The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 400 g?
- How much is the postage if a parcel has a mass of 2.2 kg?
(a)
Postage cost of the parcel with a mass of 400 g
= 3.90 + 0.80
= $4.70
(b)
1 kg = 1000 g
2.2 kg = 2.2 x 1000 = 2200 g
Cost for first 300 g = $3.90
Remaining mass
= 2200 - 300
= 1900 g
Number of sets of 100 g
= 1900 ÷ 100
= 19
Cost for remaining 1900 g
= 19 x 0.80
= $15.20
Postage cost of the parcel with a mass of 2.2 kg
= 15.20 + 3.90
= $19.10
Answer(s): (a) $4.70 (b) $19.10