The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 850 g?
- How much is the postage if a parcel has a mass of 2.5 kg?
(a)
Postage cost of the parcel with a mass of 850 g
= 3.80 + 0.40
= $4.20
(b)
1 kg = 1000 g
2.5 kg = 2.5 x 1000 = 2500 g
Cost for first 800 g = $3.80
Remaining mass
= 2500 - 800
= 1700 g
Number of sets of 50 g
= 1700 ÷ 50
= 34
Cost for remaining 1700 g
= 34 x 0.40
= $13.60
Postage cost of the parcel with a mass of 2.5 kg
= 13.60 + 3.80
= $17.40
Answer(s): (a) $4.20 (b) $17.40