The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 400 g?
- How much is the postage if a parcel has a mass of 1.2 kg?
(a)
Postage cost of the parcel with a mass of 400 g
= 2.00 + 0.90
= $2.90
(b)
1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g
Cost for first 300 g = $2.00
Remaining mass
= 1200 - 300
= 900 g
Number of sets of 100 g
= 900 ÷ 100
= 9
Cost for remaining 900 g
= 9 x 0.90
= $8.10
Postage cost of the parcel with a mass of 1.2 kg
= 8.10 + 2.00
= $10.10
Answer(s): (a) $2.90 (b) $10.10