Let the person work for x days. ∴ Number of days he does not work =30−x Salary he gets for working x days =₹x×500=₹500x Fine for the day he does not work =₹100(30−x) Now, according to the question, 500x−100(30−x)=11400 ⇒500x−3000+100x=11400 ⇒600x=11400+3000 ⇒600x=14400 ⇒x=