The table shows the postage rates by mass for delivery of parcels.
- How much is the postage if a parcel has a mass of 550 g?
- How much is the postage if a parcel has a mass of 1.9 kg?
(a)
Cost
= 2.35 + 0.30
= $2.65
(b)
1 kg = 1000 g
1.9 kg = 1.9 x 1000 = 1900 g
Cost for first 450 g = $2.35
Remaining mass
= 1900 - 450
= 1450 g
Number of sets of 100 g
= 1450 ÷ 100
= 14.5
Number of sets of 100 g to pay for
= 14 + 1
= 15
Cost for remaining 1450 g
= 15 x 0.30
= $4.50
Total cost
= 4.50 + 2.35
= $6.85
Answer(s): (a) $2.65; (b) $6.85