Correct Option: C

As we know the formula for Equivalent discount for two successive discount.

Equivalent discount =   10 + 5 −	10 × 5	= 14.5%
	100

∴  C P (for buyer) = 85.5% of ₹ 200000

= ₹		85.5 × 200000		= ₹ 171000
		100

Selling Price = ₹ 179550
Profit = ₹ (179550 – 171000) = ₹ 8550

∴  Gain % =	8550	× 100 = 5%
	171000

Alternate method to solve this question :
Here, Marked Price = 200000, Selling Price is Cost Price for buyer.
D₁ = 5%,
D₂ = 10%

Selling Price = Marked Price		100 − D1			100 − D2
		100			100

= 200000		100 − 5			100 − 10
		100			100

= 20 × 95 × 90 = 1800 x 95
Cost Price for buyer = 171000
Selling Price for buyer = 179550

Profit =	Selling Price − Cost Price	× 100%
	C.P.

=	8550	× 100 = 5%
	171000