The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 950 g?
- How much is the postage if a parcel has a mass of 2.6 kg?
(a)
Cost
= 3.90 + 0.40
= $4.30
(b)
1 kg = 1000 g
2.6 kg = 2.6 x 1000 = 2600 g
Cost for first 850 g = $3.90
Remaining mass
= 2600 - 850
= 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 0.40
= $7.20
Total cost
= 7.20 + 3.90
= $11.10
Answer(s): (a) $4.30; (b) $11.10