The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 650 g?
- How much is the postage if a parcel has a mass of 1.7 kg?
(a)
Cost
= 3.90 + 0.20
= $4.10
(b)
1 kg = 1000 g
1.7 kg = 1.7 x 1000 = 1700 g
Cost for first 550 g = $3.90
Remaining mass
= 1700 - 550
= 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 0.20
= $2.40
Total cost
= 2.40 + 3.90
= $6.30
Answer(s): (a) $4.10; (b) $6.30