The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 650 g?
- How much is the postage if a parcel has a mass of 1.4 kg?
(a)
Cost
= 30 + 0.70
= $30.70
(b)
1 kg = 1000 g
1.4 kg = 1.4 x 1000 = 1400 g
Cost for first 550 g = $30
Remaining mass
= 1400 - 550
= 850 g
Number of sets of 100 g
= 850 ÷ 100
= 8.5
Number of sets of 100 g to pay for
= 8 + 1
= 9
Cost for remaining 850 g
= 9 x 0.70
= $6.30
Total cost
= 6.30 + 30
= $36.30
Answer(s): (a) $30.70; (b) $36.30