Final answer:
To calculate the average kWh per day usage after a 4.5% increase, multiply the current average (55 kWh) by 0.045 to find the increase amount, then add this to the original average. The new average is 57.475 kWh per day.
Step-by-step explanation:
The student is asking how to calculate the new average kWh per day usage if their current usage increases by 4.5%. To find the new usage, you multiply the current average by the increase percentage and then add that to the current average.
Start with the current average usage, which is 55 kWh per day. Calculate 4.5% of this amount by multiplying 55 kWh by 0.045 (4.5/100 to convert percentage to a decimal). You get 2.475 kWh. Then, you add this increase back to the original average to find the new average usage:
55 kWh + 2.475 kWh = 57.475 kWh per day.
Therefore, the new average kWh per day usage after a 4.5% increase would be 57.475 kWh per day.