A man sells rice at 10%profit and uses weight 30% less then

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A man sells rice at 10%profit and uses weight 30% less then the actual measure. His gain percent is ?

1. 57²/₈%
2. 57¹/₇%
3. 57²/₅%
4. 57³/₇%
5. None of the above

Correct Option: B

Let the marked weight = 1 kg = 1000g
Real weight = 70% of 1000 = 700g
Let CP of 1g = ₹ 1
∴ CP of 700g = ₹ 700
CP of 1000g = ₹ 1000
SP = 110% of 1000
= 110/100 x 1000 = ₹ 1100
Gain = 1100 - 700 = ₹ 400
∴ Gain % = (400/700) x 100%
= 57¹/₇%