Question

A shopkeeper sells an article for 21384 including 10% tax however the actual rate of tax is 8% find the extra profit made by the dealer

Answer 1

    Let the actual price of the article be x.
     Price including 10% tax=21384
=>x+10/100*x=21384
=>11x/10=21384
=>x=(21384*10)/11=19440
                       Hence, the original price is 19440
            Now price including 8% tax=19440+19440*8/100=20995.20
          .: Profit made by the dealer=21384-20995.20= 388.80(Ans.)

                        [Note: * means Multiplication]