The marked price of a book is Rs 4200. The shopkeeper gives two successive discounts of 25% and y% to the customer. If the customer pays Rs 2898 for the book, then what is the value (in percentage) of y?
Marked price = Rs. 4200
After first discount of 25%, price of pen = $$4200-(\frac{25}{100}\times4200)$$
=Â $$4200-1050=Rs.$$ $$3150$$
After 2nd discount of $$y\%$$, price =Â $$3150-(\frac{y}{100}\times3150)=2898$$
=> $$31.5y=3150-2898$$
=> $$31.5y=252$$
=> $$y=\frac{252}{31.5}=8\%$$
=> Ans - (B)
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