If the duty on an article is reduced by 40% of its present

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If the duty on an article is reduced by 40% of its present rate, by how much per cent must its consumption increase in order that the revenue remains unaltered ?

1. 60%
2. 62 1 %
  3
3. 72%
4. 66 2 %
  3

Correct Option: D

Using Rule 9,
Required increase percent

=	40	× 100
	100 - 40

=	40	× 100 =	200	= 66	2	%
	60		3		3