The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 450 g?
- How much is the postage if a parcel has a mass of 2.6 kg?
(a)
Cost
= 2.90 + 0.90
= $3.80
(b)
1 kg = 1000 g
2.6 kg = 2.6 x 1000 = 2600 g
Cost for first 350 g = $2.90
Remaining mass
= 2600 - 350
= 2250 g
Number of sets of 100 g
= 2250 ÷ 100
= 22.5
Number of sets of 100 g to pay for
= 22 + 1
= 23
Cost for remaining 2250 g
= 23 x 0.90
= $20.70
Total cost
= 20.70 + 2.90
= $23.60
Answer(s): (a) $3.80; (b) $23.60