The table shows the rates charged for the use of electricity in a country.
- Asher and his family used 25 units of electricity in April. How much did they pay for the usage of electricity in April?
- Erika and her family paid $133.30 for the usage of electricity in May. How many units of electricity did they use in May?
(a)
Amount that Asher and his family paid for the usage of electricity
= 25 x 0.91
= $22.75
(b)
Amount that Erika and her family paid for first 40 units of electricity
= 40 x 0.91
= $36.40
Amount that Erika and her family paid for next 40 units of electricity
= 40 x 1.16
= $46.40
Amount that Erika and her family paid for the remaining units of electricity
= 133.30 - 36.40 - 46.40
= $50.50
Remaining units of electricity that Erika and her family used
= 50.50 ÷ 2.02
= 25
Total number of units of electricity that Erika and her family used
= 40 + 40 + 25
= 105
Answer(s): (a) $22.75; (b) 105