The table shows the rates charged for the use of utility in a country.
- John and his family used 15 units of utility in March. How much did they pay for the usage of utility in March?
- Zoe and her family paid $102.45 for the usage of utility in April. How many units of utility did they use in April?
(a)
Amount that John and his family paid for the usage of utility
= 15 x 0.87
= $13.05
(b)
Amount that Zoe and her family paid for first 30 units of utility
= 30 x 0.87
= $26.10
Amount that Zoe and her family paid for next 30 units of utility
= 30 x 1.52
= $45.60
Amount that Zoe and her family paid for the remaining units of utility
= 102.45 - 26.10 - 45.60
= $30.75
Remaining units of utility that Zoe and her family used
= 30.75 ÷ 2.05
= 15
Total number of units of utility that Zoe and her family used
= 30 + 30 + 15
= 75
Answer(s): (a) $13.05; (b) 75
