Question

2.7.

If 10% of an electricity bill is deducted, Rs. 45 is till to be paid How much was the bill? 1) Rs. 50 2) Rs.60 3) Rs.55

4) None of these 5) None​

Answer 1

Question :

If 10% of an electricity bill is deducted, Rs. 45 is till to be paid How much was the bill?

Answer :

$\sf\pink {Given :}$

• 10 percentage of an electricity bill is deducted.

• Bill need to be paid after the deduction is RS 45 .

$\sf\pink {To\:find :}$

• How much was the bill ?

Explanation :

• let the bill be "x" .

Equation formed =

$\\ \longrightarrow\sf {x - x\times \dfrac {10}{100} = 45 }$

$\\ \longrightarrow\sf {x - \dfrac {10x}{100} = 45 }$

$\\ \longrightarrow\sf { \dfrac {100x - 10x}{100} = 45 }$

$\\ \longrightarrow\sf { \dfrac {90x}{100} = 45 }$

$\\ \longrightarrow\sf { 90x = 4500}$

$\\ \longrightarrow\sf { x = \dfrac {4500}{90}}$

$\\ \longrightarrow\sf { x = \dfrac {450}{9}}$

$\\ \longrightarrow\sf { x = 50}$

• Therefore the bill is Rs 50 .