The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 950 g?
- How much is the postage if a parcel has a mass of 2.7 kg?
(a)
Cost
= 3.70 + 0.20
= $3.90
(b)
1 kg = 1000 g
2.7 kg = 2.7 x 1000 = 2700 g
Cost for first 850 g = $3.70
Remaining mass
= 2700 - 850
= 1850 g
Number of sets of 100 g
= 1850 ÷ 100
= 18.5
Number of sets of 100 g to pay for
= 18 + 1
= 19
Cost for remaining 1850 g
= 19 x 0.20
= $3.80
Total cost
= 3.80 + 3.70
= $7.50
Answer(s): (a) $3.90; (b) $7.50