The table shows the rates charged for the use of utility in a country.
- Daniel and his family used 30 units of utility in May. How much did they pay for the usage of utility in May?
- Olivia and her family paid $210.50 for the usage of utility in June. How many units of utility did they use in June?
(a)
Amount that Daniel and his family paid for the usage of utility
= 30 x 0.79
= $23.70
(b)
Amount that Olivia and her family paid for first 40 units of utility
= 40 x 0.79
= $31.60
Amount that Olivia and her family paid for next 40 units of utility
= 40 x 1.41
= $56.40
Amount that Olivia and her family paid for the remaining units of utility
= 210.50 - 31.60 - 56.40
= $122.50
Remaining units of utility that Olivia and her family used
= 122.50 ÷ 2.45
= 50
Total number of units of utility that Olivia and her family used
= 40 + 40 + 50
= 130
Answer(s): (a) $23.70; (b) 130