If 20% of an electricity bill is deducted, then Rs. 100 is till to be paid. How much was the original bill?

Correct Answer: C. Rs. 125

To solve this problem, let’s denote the original electricity bill amount as $x$.

If 20% of the bill is deducted, the remaining amount to be paid is $100$. This means 80% of the bill remains.

We can set up the equation as follows:
0.80×x=100
Now, let’s solve for $x$:
x=100​/0.80=125

So, the original electricity bill was Rs. 125.

Therefore, the correct answer is C. Rs. 125.