Johns salary was decreased by 50% and subsequently increased by 50%. How much percent does he loss?
Let Johns initial salary = Rs.100
After decreasing by 50%, Johns salary = Rs. 50 [because it will become half]
After subsequently increasing by 50%, Johns salary
=50×$\dfrac{100+50}{100}$=50×$\dfrac{150}{100}$= Rs.$75$
Loss = $100-75=$ Rs.$25$
Loss percent =$\dfrac{25}{100}$×100=25%
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