The table shows the rates charged for the use of electricity in a country.
- Owen and his family used 25 units of electricity in March. How much did they pay for the usage of electricity in March?
- Raeann and her family paid $142.80 for the usage of electricity in April. How many units of electricity did they use in April?
(a)
Amount that Owen and his family paid for the usage of electricity
= 25 x 0.98
= $24.50
(b)
Amount that Raeann and her family paid for first 30 units of electricity
= 30 x 0.98
= $29.40
Amount that Raeann and her family paid for next 30 units of electricity
= 30 x 1.29
= $38.70
Amount that Raeann and her family paid for the remaining units of electricity
= 142.80 - 29.40 - 38.70
= $74.70
Remaining units of electricity that Raeann and her family used
= 74.70 ÷ 2.49
= 30
Total number of units of electricity that Raeann and her family used
= 30 + 30 + 30
= 90
Answer(s): (a) $24.50; (b) 90