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 1.9 kg?
(a)
Cost
= 3.00 + 0.90
= $3.90
(b)
1 kg = 1000 g
1.9 kg = 1.9 x 1000 = 1900 g
Cost for first 850 g = $3.00
Remaining mass
= 1900 - 850
= 1050 g
Number of sets of 100 g
= 1050 ÷ 100
= 10.5
Number of sets of 100 g to pay for
= 10 + 1
= 11
Cost for remaining 1050 g
= 11 x 0.90
= $9.90
Total cost
= 9.90 + 3.00
= $12.90
Answer(s): (a) $3.90; (b) $12.90