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)
Cost
= 3.40 + 0.80
= $4.20
(b)
1 kg = 1000 g
2.1 kg = 2.1 x 1000 = 2100 g
Cost for first 350 g = $3.40
Remaining mass
= 2100 - 350
= 1750 g
Number of sets of 100 g
= 1750 ÷ 100
= 17.5
Number of sets of 100 g to pay for
= 17 + 1
= 18
Cost for remaining 1750 g
= 18 x 0.80
= $14.40
Total cost
= 14.40 + 3.40
= $17.80
Answer(s): (a) $4.20; (b) $17.80