The table shows the rates charged for the use of utility in a country.
- Sam and his family used 30 units of utility in April. How much did they pay for the usage of utility in April?
- Yoko and her family paid $191.30 for the usage of utility in May. How many units of utility did they use in May?
(a)
Amount that Sam and his family paid for the usage of utility
= 30 x 0.89
= $26.70
(b)
Amount that Yoko and her family paid for first 40 units of utility
= 40 x 0.89
= $35.60
Amount that Yoko and her family paid for next 40 units of utility
= 40 x 1.17
= $46.80
Amount that Yoko and her family paid for the remaining units of utility
= 191.30 - 35.60 - 46.80
= $108.90
Remaining units of utility that Yoko and her family used
= 108.90 ÷ 2.42
= 45
Total number of units of utility that Yoko and her family used
= 40 + 40 + 45
= 125
Answer(s): (a) $26.70; (b) 125