The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 850 g?
- How much is the postage if a parcel has a mass of 1.5 kg?
(a)
Cost
= 2.20 + 0.70
= $2.90
(b)
1 kg = 1000 g
1.5 kg = 1.5 x 1000 = 1500 g
Cost for first 750 g = $2.20
Remaining mass
= 1500 - 750
= 750 g
Number of sets of 100 g
= 750 ÷ 100
= 7.5
Number of sets of 100 g to pay for
= 7 + 1
= 8
Cost for remaining 750 g
= 8 x 0.70
= $5.60
Total cost
= 5.60 + 2.20
= $7.80
Answer(s): (a) $2.90; (b) $7.80