Christy donated 10% of his income to an orphanage and deposited

Christy donated 10% of his income to an orphanage and deposited 20% of the remainder in his bank. If he has now Rs. 7200 left, what is his income.

Let Christy’s income = Rs. p

Amount given to orphanage = Rs.	p
	10

Remaining amount = Rs.	9p
	10

Remaining amount after depositing in bank = 80% of	9p
	10

= Rs.		9p	×	80
		10		100

= Rs.	18p
	25

According to the question,

	18p	= 7200
	25

⇒ 18p = 25 × 7200

⇒ p =	25 × 7200	= Rs. 10000
	18