The cost of water in the area where the Jones family lives is scheduled to increase by 35% next year. Since the Jones family cannot afford an increase in their water bill, how much will they have to reduce consumption to keep their cost the same?
Choose the correct choice from the following answers.
A) None	B) 25.9%	C) 10.2%	D) 45%	E) 15.5%
Solution: Let the current water expense be represented by Rs. 100.   The cost of water rises 35%. So, to buy same amount of water, they need to increase their expense,   = (100 + 35% of 100) = Rs. 135.   But, they want to keep water expense the same, so they have to cut Rs. by 35 to keep it to Rs. =100.   The % decrease in consumption is,   (35/135)*100 = 25.9%.   Mental Calculation Method;   100-----35%↑---→135------X%↓---→100.   Here, X = (35/135)*100 = 25.9%.   Answer: Option 25.9%
<result>B</result>
The cost of water in the area where the Jones family lives is scheduled to increase by 35% next year. Since the Jones family cannot afford an increase in their water bill, how much will they have to reduce consumption to keep their cost the same?