Answer:
Total amount spread on electricity in three months is $784.98.
Step-by-step explanation:
Tan's electricity bill for the month of August was $267.00.
It is given that the September bill showed a 2% increase from his August bill.
Increase in electricity bill is 2% of $267.00.

The electricity bill for the month of September is

It is given that in October, his bill decreased 8% from the amount he was billed in August.
decrease in electricity bill is 8% of $267.00.

The electricity bill for the month of October is

Total amount spread on electricity is

Therefore total amount spread on electricity in three months is $784.98.