If the duty on an article be reduced by 40% of its present amount, then by how much percent must the consumption be increased in order that the revenue may remain unaltered?

If the duty on an article be reduced by 40% of its present amount, the

1.	If the duty on an article be reduced by 40% of its present amount, then by how much percent must the consumption be increased in order that the revenue may remain unaltered?
A.	0.5
B.	\[166\frac{2}{3}\,\,%\]
C.	0.4
D.	0.2
E.	None of these
Answer» C. 0.4

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If the duty on an article be reduced by 40% of its present amount, then by how much percent must the consumption be increased in order that the revenue may remain unaltered?

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