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 2.1 kg?
(a)
Postage cost of the parcel with a mass of 550 g
= 3.10 + 0.70
= $3.80
(b)
1 kg = 1000 g
2.1 kg = 2.1 x 1000 = 2100 g
Cost for first 500 g = $3.10
Remaining mass
= 2100 - 500
= 1600 g
Number of sets of 50 g
= 1600 ÷ 50
= 32
Cost for remaining 1600 g
= 32 x 0.70
= $22.40
Postage cost of the parcel with a mass of 2.1 kg
= 22.40 + 3.10
= $25.50
Answer(s): (a) $3.80 (b) $25.50