The table shows the rates charged for the use of water in a country.
- Neave and his family used 30 units of water in April. How much did they pay for the usage of water in April?
- Penelope and her family paid $187.80 for the usage of water in May. How many units of water did they use in May?
(a)
Amount that Neave and his family paid for the usage of water
= 30 x 0.89
= $26.70
(b)
Amount that Penelope and her family paid for first 40 units of water
= 40 x 0.89
= $35.60
Amount that Penelope and her family paid for next 40 units of water
= 40 x 1.23
= $49.20
Amount that Penelope and her family paid for the remaining units of water
= 187.80 - 35.60 - 49.20
= $103.00
Remaining units of water that Penelope and her family used
= 103.00 ÷ 2.06
= 50
Total number of units of water that Penelope and her family used
= 40 + 40 + 50
= 130
Answer(s): (a) $26.70; (b) 130