The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 800 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 800 g
= 3.70 + 0.50
= $4.20
(b)
1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g
Cost for first 750 g = $3.70
Remaining mass
= 1200 - 750
= 450 g
Number of sets of 50 g
= 450 ÷ 50
= 9
Cost for remaining 450 g
= 9 x 0.50
= $4.50
Postage cost of the parcel with a mass of 1.2 kg
= 4.50 + 3.70
= $8.20
Answer(s): (a) $4.20 (b) $8.20