Question

Rates of electricity charges increased by 25%. In
order to keep expenses on electricity at the same level, by what per cent
a family should reduce its consumption of electricity ?​

Answer 1

Answer:

20%

Step-by-step explanation:

Lets consider the family uses 100 watts and for Rs. 1000

Now the cost as been increased by 25%, hence the new cost will be 1250 [ 1000 +( 1000*25%)]

If the cost has to remain same as 1000, the consumption should be

100*1000 = 80

1250

Hence the consumption has been decreased by 20 ( 100 - 80 )