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A man's working hours per day were increased by 20% and his wages per day were decreased by 15% .at what % were his daily earnings increased?



May be this answer is wrong, but i know this. so , it may be helpful

There is a maths formula to calculate the Net Increase or Decrease percentage :-
Net %age increase or decrease = 

We can use the above formula directly if values of a and b can be are in the form of multiplication in the question. In the question, let number of days be one value and number of wages PER DAY be another value. We get to know that the net wage will be in the form of multiplication of the above values. 

So, by using the formula we can write that :-

= 2%

0 0 0
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