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 1.9 kg?
(a)
Postage cost of the parcel with a mass of 500 g
= 3.60 + 0.30
= $3.90
(b)
1 kg = 1000 g
1.9 kg = 1.9 x 1000 = 1900 g
Cost for first 400 g = $3.60
Remaining mass
= 1900 - 400
= 1500 g
Number of sets of 100 g
= 1500 ÷ 100
= 15
Cost for remaining 1500 g
= 15 x 0.30
= $4.50
Postage cost of the parcel with a mass of 1.9 kg
= 4.50 + 3.60
= $8.10
Answer(s): (a) $3.90 (b) $8.10