The table shows the rates charged for the use of electricity in a country.
- Julian and his family used 25 units of electricity in March. How much did they pay for the usage of electricity in March?
- Diana and her family paid $194.60 for the usage of electricity in April. How many units of electricity did they use in April?
(a)
Amount that Julian and his family paid for the usage of electricity
= 25 x 0.89
= $22.25
(b)
Amount that Diana and her family paid for first 40 units of electricity
= 40 x 0.89
= $35.60
Amount that Diana and her family paid for next 40 units of electricity
= 40 x 1.59
= $63.60
Amount that Diana and her family paid for the remaining units of electricity
= 194.60 - 35.60 - 63.60
= $95.40
Remaining units of electricity that Diana and her family used
= 95.40 ÷ 2.12
= 45
Total number of units of electricity that Diana and her family used
= 40 + 40 + 45
= 125
Answer(s): (a) $22.25; (b) 125