A house was sold for Rs. y by giving a discount of x%, then

A house was sold for Rs. y by giving a discount of x%, then the list price was :

Let the marked price of building be Rs. z.
∴ According to the question,
z × (100 – x)% = y

⇒ z ×	100 − x	= y
	100

⇒ z = Rs.	100y
	100 − x

Second Method :
S.P. = Rs. y, D = x %

M.P. =	SP × 100
	100 − D

M.P. =	y × 100
	100 − x