The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 550 g?
- How much is the postage if a parcel has a mass of 2.5 kg?
(a)
Cost
= 2.15 + 0.60
= $2.75
(b)
1 kg = 1000 g
2.5 kg = 2.5 x 1000 = 2500 g
Cost for first 450 g = $2.15
Remaining mass
= 2500 - 450
= 2050 g
Number of sets of 100 g
= 2050 ÷ 100
= 20.5
Number of sets of 100 g to pay for
= 20 + 1
= 21
Cost for remaining 2050 g
= 21 x 0.60
= $12.60
Total cost
= 12.60 + 2.15
= $14.75
Answer(s): (a) $2.75; (b) $14.75