After the retirement of a partner, A’s new profit share is \(13/21\) and his old profit share was \(3/7\). What is A’s gaining share?

Correct answer: \(4/21\)

Gaining share = new profit share − old profit share. Convert the old share to the common denominator: \(3/7=9/21\). Therefore, A’s gaining share is \(13/21-9/21=4/21\). Option B is only the new share and option C is only the old share, not the gain. Exam tip: Use a common denominator before subtracting the old share from the new share.