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 2.8 kg?
(a)
Cost
= 2.00 + 0.20
= $2.20
(b)
1 kg = 1000 g
2.8 kg = 2.8 x 1000 = 2800 g
Cost for first 450 g = $2.00
Remaining mass
= 2800 - 450
= 2350 g
Number of sets of 100 g
= 2350 ÷ 100
= 23.5
Number of sets of 100 g to pay for
= 23 + 1
= 24
Cost for remaining 2350 g
= 24 x 0.20
= $4.80
Total cost
= 4.80 + 2.00
= $6.80
Answer(s): (a) $2.20; (b) $6.80