Question : Directions: A father increases the pocket money of his son by 20%. If the son gets Rs. 300 after the increase, find his pocket money before the increase.
Option 1: Rs. 250
Option 2: Rs. 240
Option 3: Rs. 200
Option 4: Rs. 230
Correct Answer: Rs. 250
Solution : Let the pocket money of the son before the increase be Rs. A
Pocket money after the increase of 20% = $A + (\frac{A × 20}{100})$
According to the given statement,
⇒ $A + (\frac{20A}{100})=300$
⇒ $\frac{100A+20A}{100}=300$
⇒ $\frac{120A}{100}=300$
⇒ $A = \frac{300×100}{120}$
⇒ A = 250
So, the pocket money of the son before the increase was Rs. 250. Hence, the first option is correct.
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