If food prices go up by 10%, by how much should a man reduce

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If food prices go up by 10%, by how much should a man reduce his consumption so as not to increase his expenditure?

1. 9 1 %
  11
2. 10%
3. 11 1 %
  9
4. The data is not sufficient

Correct Option: A

Using Rule 8,
Required answer

=	10	× 100
	(100 + 10)

=	10	× 100
	110

=	100	% = 9	1	%
	11		11