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 1.3 kg?
(a)
Postage cost of the parcel with a mass of 500 g
= 3.80 + 0.60
= $4.40
(b)
1 kg = 1000 g
1.3 kg = 1.3 x 1000 = 1300 g
Cost for first 400 g = $3.80
Remaining mass
= 1300 - 400
= 900 g
Number of sets of 100 g
= 900 ÷ 100
= 9
Cost for remaining 900 g
= 9 x 0.60
= $5.40
Postage cost of the parcel with a mass of 1.3 kg
= 5.40 + 3.80
= $9.20
Answer(s): (a) $4.40 (b) $9.20