Answer:
D.$45.58
Explanation:
The monthly charge for 300 kWh of electricity during the second period will be:
$6.08 + $0.13(250) + $0.14(50)
$6.08 + $32.5 + $7
= $45.58
The first 250 kWh of electricity used will be at the range of 0 - 250 and the remaining 50 kWh will be at the range of 251 - 360.