The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 800 g?
- How much is the postage if a parcel has a mass of 1.9 kg?
(a)
Postage cost of the parcel with a mass of 800 g
= 2.10 + 0.20
= $2.30
(b)
1 kg = 1000 g
1.9 kg = 1.9 x 1000 = 1900 g
Cost for first 700 g = $2.10
Remaining mass
= 1900 - 700
= 1200 g
Number of sets of 100 g
= 1200 ÷ 100
= 12
Cost for remaining 1200 g
= 12 x 0.20
= $2.40
Postage cost of the parcel with a mass of 1.9 kg
= 2.40 + 2.10
= $4.50
Answer(s): (a) $2.30 (b) $4.50