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 1.2 kg?
(a)
Cost
= 3.10 + 0.70
= $3.80
(b)
1 kg = 1000 g
1.2 kg = 1.2 x 1000 = 1200 g
Cost for first 750 g = $3.10
Remaining mass
= 1200 - 750
= 450 g
Number of sets of 100 g
= 450 ÷ 100
= 4.5
Number of sets of 100 g to pay for
= 4 + 1
= 5
Cost for remaining 450 g
= 5 x 0.70
= $3.50
Total cost
= 3.50 + 3.10
= $6.60
Answer(s): (a) $3.80; (b) $6.60