The table shows the rates charged for the use of utility in a country.
- Perry and his family used 35 units of utility in May. How much did they pay for the usage of utility in May?
- Nicole and her family paid $210.20 for the usage of utility in June. How many units of utility did they use in June?
(a)
Amount that Perry and his family paid for the usage of utility
= 35 x 0.89
= $31.15
(b)
Amount that Nicole and her family paid for first 40 units of utility
= 40 x 0.89
= $35.60
Amount that Nicole and her family paid for next 40 units of utility
= 40 x 1.39
= $55.60
Amount that Nicole and her family paid for the remaining units of utility
= 210.20 - 35.60 - 55.60
= $119.00
Remaining units of utility that Nicole and her family used
= 119.00 ÷ 2.38
= 50
Total number of units of utility that Nicole and her family used
= 40 + 40 + 50
= 130
Answer(s): (a) $31.15; (b) 130
