The table shows the rates charged for the use of utility in a country.
- Luke and his family used 25 units of utility in May. How much did they pay for the usage of utility in May?
- Anna and her family paid $111.20 for the usage of utility in June. How many units of utility did they use in June?
(a)
Amount that Luke and his family paid for the usage of utility
= 25 x 0.85
= $21.25
(b)
Amount that Anna and her family paid for first 30 units of utility
= 30 x 0.85
= $25.50
Amount that Anna and her family paid for next 30 units of utility
= 30 x 1.43
= $42.90
Amount that Anna and her family paid for the remaining units of utility
= 111.20 - 25.50 - 42.90
= $42.80
Remaining units of utility that Anna and her family used
= 42.80 ÷ 2.14
= 20
Total number of units of utility that Anna and her family used
= 30 + 30 + 20
= 80
Answer(s): (a) $21.25; (b) 80