The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 500 g?
- How much is the postage if a parcel has a mass of 1.6 kg?
(a)
Postage cost of the parcel with a mass of 500 g
= 3.20 + 0.20
= $3.40
(b)
1 kg = 1000 g
1.6 kg = 1.6 x 1000 = 1600 g
Cost for first 400 g = $3.20
Remaining mass
= 1600 - 400
= 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 1.6 kg
= 2.40 + 3.20
= $5.60
Answer(s): (a) $3.40 (b) $5.60