The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 550 g?
- How much is the postage if a parcel has a mass of 1.3 kg?
(a)
Cost
= 2.40 + 0.30
= $2.70
(b)
1 kg = 1000 g
1.3 kg = 1.3 x 1000 = 1300 g
Cost for first 450 g = $2.40
Remaining mass
= 1300 - 450
= 850 g
Number of sets of 100 g
= 850 ÷ 100
= 8.5
Number of sets of 100 g to pay for
= 8 + 1
= 9
Cost for remaining 850 g
= 9 x 0.30
= $2.70
Total cost
= 2.70 + 2.40
= $5.10
Answer(s): (a) $2.70; (b) $5.10