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 1.4 kg?
(a)
Cost
= 3.80 + 0.40
= $4.20
(b)
1 kg = 1000 g
1.4 kg = 1.4 x 1000 = 1400 g
Cost for first 350 g = $3.80
Remaining mass
= 1400 - 350
= 1050 g
Number of sets of 100 g
= 1050 ÷ 100
= 10.5
Number of sets of 100 g to pay for
= 10 + 1
= 11
Cost for remaining 1050 g
= 11 x 0.40
= $4.40
Total cost
= 4.40 + 3.80
= $8.20
Answer(s): (a) $4.20; (b) $8.20