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 1.2 kg?
(a)
Cost
= 3.80 + 0.50
= $4.30
(b)
1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g
Cost for first 350 g = $3.80
Remaining mass
= 1200 - 350
= 850 g
Number of sets of 100 g
= 850 ÷ 100
= 8.5
Number of sets of 100 g to pay for
= 8 + 1
= 9
Cost for remaining 850 g
= 9 x 0.50
= $4.50
Total cost
= 4.50 + 3.80
= $8.30
Answer(s): (a) $4.30; (b) $8.30