The table shows the rates charged for the use of utility in a country.
- Jeremy and his family used 30 units of utility in May. How much did they pay for the usage of utility in May?
- Gillian and her family paid $168.30 for the usage of utility in June. How many units of utility did they use in June?
(a)
Amount that Jeremy and his family paid for the usage of utility
= 30 x 0.76
= $22.80
(b)
Amount that Gillian and her family paid for first 40 units of utility
= 40 x 0.76
= $30.40
Amount that Gillian and her family paid for next 40 units of utility
= 40 x 1.13
= $45.20
Amount that Gillian and her family paid for the remaining units of utility
= 168.30 - 30.40 - 45.20
= $92.70
Remaining units of utility that Gillian and her family used
= 92.70 ÷ 2.06
= 45
Total number of units of utility that Gillian and her family used
= 40 + 40 + 45
= 125
Answer(s): (a) $22.80; (b) 125
