The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 900 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 900 g
= 2.50 + 0.30
= $2.80
(b)
1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g
Cost for first 850 g = $2.50
Remaining mass
= 1200 - 850
= 350 g
Number of sets of 50 g
= 350 ÷ 50
= 7
Cost for remaining 350 g
= 7 x 0.30
= $2.10
Postage cost of the parcel with a mass of 1.2 kg
= 2.10 + 2.50
= $4.60
Answer(s): (a) $2.80 (b) $4.60