The table shows the rates charged for the use of electricity in a country.

1. Cole and his family used 15 units of electricity in January. How much did they pay for the usage of electricity in January?
2. Raeann and her family paid $144.05 for the usage of electricity in February. How many units of electricity did they use in February?

(a)
Amount that Cole and his family paid for the usage of electricity
= 15 x 0.93
= $13.95

(b)
Amount that Raeann and her family paid for first 30 units of electricity
= 30 x 0.93
= $27.90

Amount that Raeann and her family paid for next 30 units of electricity
= 30 x 1.48
= $44.40

Amount that Raeann and her family paid for the remaining units of electricity
= 144.05 - 27.90 - 44.40
= $71.75

Remaining units of electricity that Raeann and her family used
= 71.75 ÷ 2.05
= 35

Total number of units of electricity that Raeann and her family used
= 30 + 30 + 35
= 95

Answer(s): (a) $13.95; (b) 95