The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 850 g?
- How much is the postage if a parcel has a mass of 1.3 kg?
(a)
Cost
= 2.15 + 0.70
= $2.85
(b)
1 kg = 1000 g
1.3 kg = 1.3 x 1000 = 1300 g
Cost for first 750 g = $2.15
Remaining mass
= 1300 - 750
= 550 g
Number of sets of 100 g
= 550 ÷ 100
= 5.5
Number of sets of 100 g to pay for
= 5 + 1
= 6
Cost for remaining 550 g
= 6 x 0.70
= $4.20
Total cost
= 4.20 + 2.15
= $6.35
Answer(s): (a) $2.85; (b) $6.35