A person marks the price of his car 50% above the cost price. He gives a discount of B% and earns a profit of 10%. What is the approximate value of B?

26.67

        CP                    MP

      100 - B%           100 + P%

     100 - B%           100 + 10%

    100 - B%                 110

\(\frac{15}{10}\) = \(\frac{110}{100 - B%}\)

\(\frac{3}{2}\) = \(\frac{110}{100 - B%}\)

3(100 - B%) = 220

B% = 26.67%