A trader who marks his goods up to 50% offered a discount

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A trader who marks his goods up to 50% offered a discount of 20%. What % profit the trader makes after offering the payment ?

1. 30%
2. 70%
3. 20%
4. 50%

Correct Option: C

∴ Required discount =		50 − 20 −	50 × 20		% = 20%
			100

Detailed Method
C.P. of article = Rs. 100
Marked price = Rs. 150

S.P. =	150 × 80	= Rs. 120
	100

Gain per cent = 20%