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 2.9 kg?
(a)
Postage cost of the parcel with a mass of 500 g
= 2.40 + 0.70
= $3.10
(b)
1 kg = 1000 g
2.9 kg = 2.9 x 1000 = 2900 g
Cost for first 400 g = $2.40
Remaining mass
= 2900 - 400
= 2500 g
Number of sets of 100 g
= 2500 ÷ 100
= 25
Cost for remaining 2500 g
= 25 x 0.70
= $17.50
Postage cost of the parcel with a mass of 2.9 kg
= 17.50 + 2.40
= $19.90
Answer(s): (a) $3.10 (b) $19.90