The table shows the rates charged for the use of utility in a country.
- Bobby and his family used 25 units of utility in January. How much did they pay for the usage of utility in January?
- Jade and her family paid $158.50 for the usage of utility in February. How many units of utility did they use in February?
(a)
Amount that Bobby and his family paid for the usage of utility
= 25 x 0.97
= $24.25
(b)
Amount that Jade and her family paid for first 40 units of utility
= 40 x 0.97
= $38.80
Amount that Jade and her family paid for next 40 units of utility
= 40 x 1.26
= $50.40
Amount that Jade and her family paid for the remaining units of utility
= 158.50 - 38.80 - 50.40
= $69.30
Remaining units of utility that Jade and her family used
= 69.30 ÷ 2.31
= 30
Total number of units of utility that Jade and her family used
= 40 + 40 + 30
= 110
Answer(s): (a) $24.25; (b) 110
