8.5 kwh is equal to:

A kilowatt-hour (kWh) is the amount of electrical energy consumed by a 1000-watt appliance over the course of an hour.

According to the question, 8.5 kwh can be defined as the amount of electrical energy consumed in an hour by an 8500-watt electrical appliance.

1 Watt=1 Joule / second.

1 Kilowatt hour is 3.6 mega joules.

$8.5 kwh = 3.6\times 8.5 = 30.6 megajoules = 30.6\times {10}^{6}J$

The correct answer is 30.6x10⁶J.