The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 500 g?
- How much is the postage if a parcel has a mass of 2.7 kg?
(a)
Postage cost of the parcel with a mass of 500 g
= 3.20 + 0.90
= $4.10
(b)
1 kg = 1000 g
2.7 kg = 2.7 x 1000 = 2700 g
Cost for first 450 g = $3.20
Remaining mass
= 2700 - 450
= 2250 g
Number of sets of 50 g
= 2250 ÷ 50
= 45
Cost for remaining 2250 g
= 45 x 0.90
= $40.50
Postage cost of the parcel with a mass of 2.7 kg
= 40.50 + 3.20
= $43.70
Answer(s): (a) $4.10 (b) $43.70