Correct Option: C

As we know the formula for two successive discount.

Single equivalent discount =		D1 + D2 −	D1 × D2		%
			100

Single equivalent discount for 8% and 5% =		8 + 5 −	8 × 5		%
			100

Single equivalent discount for 8% and 5% =		8 + 5 −	8 × 5		%
			100

Single equivalent discount for 8% and 5% = (13 – 0.4) = 12.6 %

Single equivalent disconut for 12.6% and 2% =		12.6 + 2 −	12.6 × 2		%
			100

Single equivalent disconut for 12.6% and 2% = 14.6 – 0.252 = 14.348 %
∴  Net S.P = (100 – 14.348) % of 7500

∴  Net S.P =	7500 × 85.652	= ₹ 6423.90
	100

Alternate method to solve this question :
According to given question.
M.P. = ₹ 7500, S.P = ?, D₁ = 8%, D₂ = 5%, D₃ = 2%

S.P = M.P.		100 − D1			100 − D2			100 − D3
		100			100			100

S.P = 7500		100 − 8			100 − 5			100 − 2
		100			100			100

S.P = 7500 ×	92	×	95	×	98
	100		100		100

S.P = ₹ 6423.90