The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 400 g?
- How much is the postage if a parcel has a mass of 1.4 kg?
(a)
Postage cost of the parcel with a mass of 400 g
= 3.55 + 0.70
= $4.25
(b)
1 kg = 1000 g
1.4 kg = 1.4 x 1000 = 1400 g
Cost for first 350 g = $3.55
Remaining mass
= 1400 - 350
= 1050 g
Number of sets of 50 g
= 1050 ÷ 50
= 21
Cost for remaining 1050 g
= 21 x 0.70
= $14.70
Postage cost of the parcel with a mass of 1.4 kg
= 14.70 + 3.55
= $18.25
Answer(s): (a) $4.25 (b) $18.25