Water tax is increased by 20% but its consumption is decreased by 20%. Then the

Question

Water tax is increased by 20% but its consumption is decreased by 20%. Then the increase or decrease in the expenditure of the money is

Options:

A . 4% increase

B . 4% decrease

C . 5% decrease

D . No change

Answer: Option B
Answer: (b)
Using Rule 4,
If a number is increased by a% and then it is decreased by b%, then resultant change in percentage will be $(a - b - {ab}/100)$% (Negative for decrease, Positive for increase)

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