Bhavani spent 15% of his monthly income on kid’s education and 20% on food. 40% of the remaining she spent on sports and 30% on transport. She is left with an amount of Rs.10,257 after all these expenditures. What is Bhavani’s monthly income?

Rs.52,600

Let total amount = 100R

After spending 15% on kid's education and 20% on food (i.e 35% of total income)

⇒ Remaining amount = 100R × 65%, and

After spending 40% on sport & 30% on transport (i.e 70% of remaining amount)

⇒ Final remaining amount =  100R × 65% × 30%

Now, ATQ

⇒ 100R × 65% × 30% = 10257

⇒ 1R × 65 × 3 = 102570

⇒ 1R × 195 = 102570

⇒ 1R = 526

⇒ 100R = 52600 = Total Income