Bill has d animals, 28 of which were sold at a profit of 10% each while the rest were sold at a loss of 20% each. Overall, Bill made neither a profit nor a loss. Which of the following is equal to d?
Choose the correct answer:
A) 6  B) 12  C) 18  D) 24  E) 42
Total d animals, suppose each has price of x - total price = dx   now 28 were sold at profit of 10%, making equation - - 28*1.1x   now d-28 were sold at loss of 20%, making eqn --- (d-28)*0.8x   Now he made no profit or loss so,   dx = 28*1.1x + (d-28)*0.8x   solving for d, we get d=42   Ans 42
<result>E</result>
Bill has d animals, 28 of which were sold at a profit of 10% each while the rest were sold at a loss of 20% each. Overall, Bill made neither a profit nor a loss. Which of the following is equal to d?