Bill has d animals, 12 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) 36
Total d animals, suppose each has price of x - total price = dx   now 12 were sold at profit of 10%, making equation - - 12*1.1x   now d-12 were sold at loss of 20%, making eqn --- (d-12)*0.8x   Now he made no profit or loss so,   dx = 12*1.1x + (d-12)*0.8x   solving for d, we get d=18   Ans 18
<result>C</result>
Bill has d animals, 12 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?