Question

the cost of electricity in a certain city is $0.08 for each of the first 300 kwh (kilowatt - hours) and $0.13 for each kilowatt - hour over 300 kwh. find the number of kilowatt - hours used by a family that receives a $40.25 electric bill. kwh

Explanation:

Step1: Calculate cost for first 300 kWh

The cost for the first 300 kWh is $0.08\times300 = 24$ dollars.

Step2: Calculate remaining cost

The remaining cost after the first 300 kWh is $40.25 - 24=16.25$ dollars.

Step3: Calculate number of kWh over 300

Since each kWh over 300 costs $0.13$, the number of kWh over 300 is $\frac{16.25}{0.13}=125$ kWh.

Step4: Calculate total kWh

The total number of kWh used is $300 + 125=425$ kWh.

Answer:

425