The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 650 g?
- How much is the postage if a parcel has a mass of 2.1 kg?
(a)
Cost
= 2.30 + 0.40
= $2.70
(b)
1 kg = 1000 g
2.1 kg = 2.1 x 1000 = 2100 g
Cost for first 550 g = $2.30
Remaining mass
= 2100 - 550
= 1550 g
Number of sets of 100 g
= 1550 ÷ 100
= 15.5
Number of sets of 100 g to pay for
= 15 + 1
= 16
Cost for remaining 1550 g
= 16 x 0.40
= $6.40
Total cost
= 6.40 + 2.30
= $8.70
Answer(s): (a) $2.70; (b) $8.70