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 2.5 kg?
(a)
Cost
= 40 + 0.80
= $40.80
(b)
1 kg = 1000 g
2.5 kg = 2.5 x 1000 = 2500 g
Cost for first 450 g = $40
Remaining mass
= 2500 - 450
= 2050 g
Number of sets of 100 g
= 2050 ÷ 100
= 20.5
Number of sets of 100 g to pay for
= 20 + 1
= 21
Cost for remaining 2050 g
= 21 x 0.80
= $16.80
Total cost
= 16.80 + 40
= $56.80
Answer(s): (a) $40.80; (b) $56.80