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 1.5 kg?
(a)
Cost
= 3.50 + 0.30
= $3.80
(b)
1 kg = 1000 g
1.5 kg = 1.5 x 1000 = 1500 g
Cost for first 350 g = $3.50
Remaining mass
= 1500 - 350
= 1150 g
Number of sets of 100 g
= 1150 ÷ 100
= 11.5
Number of sets of 100 g to pay for
= 11 + 1
= 12
Cost for remaining 1150 g
= 12 x 0.30
= $3.60
Total cost
= 3.60 + 3.50
= $7.10
Answer(s): (a) $3.80; (b) $7.10