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 2.9 kg?
(a)
Cost
= 40 + 0.90
= $40.90
(b)
1 kg = 1000 g
2.9 kg = 2.9 x 1000 = 2900 g
Cost for first 350 g = $40
Remaining mass
= 2900 - 350
= 2550 g
Number of sets of 100 g
= 2550 ÷ 100
= 25.5
Number of sets of 100 g to pay for
= 25 + 1
= 26
Cost for remaining 2550 g
= 26 x 0.90
= $23.40
Total cost
= 23.40 + 40
= $63.40
Answer(s): (a) $40.90; (b) $63.40