The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 750 g?
- How much is the postage if a parcel has a mass of 2.5 kg?
(a)
Cost
= 2.40 + 0.50
= $2.90
(b)
1 kg = 1000 g
2.5 kg = 2.5 x 1000 = 2500 g
Cost for first 650 g = $2.40
Remaining mass
= 2500 - 650
= 1850 g
Number of sets of 100 g
= 1850 ÷ 100
= 18.5
Number of sets of 100 g to pay for
= 18 + 1
= 19
Cost for remaining 1850 g
= 19 x 0.50
= $9.50
Total cost
= 9.50 + 2.40
= $11.90
Answer(s): (a) $2.90; (b) $11.90