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 1.7 kg?
(a)
Cost
= 3.40 + 0.30
= $3.70
(b)
1 kg = 1000 g
1.7 kg = 1.7 x 1000 = 1700 g
Cost for first 450 g = $3.40
Remaining mass
= 1700 - 450
= 1250 g
Number of sets of 100 g
= 1250 ÷ 100
= 12.5
Number of sets of 100 g to pay for
= 12 + 1
= 13
Cost for remaining 1250 g
= 13 x 0.30
= $3.90
Total cost
= 3.90 + 3.40
= $7.30
Answer(s): (a) $3.70; (b) $7.30