I have solved many questions on pie chart. All are asked in 4-5 parts according to the information given in the pie chart. No matter what are you calculating and by what method, at the end all the calculated figures in all parts match up with the information given in the pie chart. This the only exception, i have seen here in the D part of this question. That is, you calculate 'other' out of 24000 and disturb the whole pie chart. The figures don't add up. Hence the confusion. Is there any way to confirm that the answer calculated out of 24000 in this thread is the correct answer?