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 1.6 kg?
(a)
Postage cost of the parcel with a mass of 900 g
= 3.10 + 0.70
= $3.80
(b)
1 kg = 1000 g
1.6 kg = 1.6 x 1000 = 1600 g
Cost for first 850 g = $3.10
Remaining mass
= 1600 - 850
= 750 g
Number of sets of 50 g
= 750 ÷ 50
= 15
Cost for remaining 750 g
= 15 x 0.70
= $10.50
Postage cost of the parcel with a mass of 1.6 kg
= 10.50 + 3.10
= $13.60
Answer(s): (a) $3.80 (b) $13.60