Question

If 20% of an electricity bill is deducted then rs 100 is still to be paid .How much was the original bill

Answer 1

Answer:

125

Step-by-step explanation:

X-20x%=100

80/100x=100

X=100×100/80

10000/80

=125

Answer 2

Given - Deduction = 20% of electricity bill

Amount left = Rupees 100

Find - Original bill

Solution - Let the original bill be x. After deduction of 20%, the remaining amount is Rupees 100. Expressing given information in mathematical form.

x - 20% of x = 100

Solving the mentioned mathematical equation to find the value of x.

x - 20/100x = 100

x - x/5 = 100

Taking L.C.M., which is 5.

5x - x = 5*100

Performing subtraction and multiplication.

4x = 500

Performing division to find the value of x.

x = 500/4

x = Rupees 125

So, the original bill is Rupees 125.