Symbiosis National Aptitude Test SNAP 2017 Paper

A and B entered into a partnership , investing ₹ 16000 and ₹ 12000 respectively. After 3 months, 'A' withdraw ₹ 5000, while B invested ₹ 5000 more. After 3 more months, C joins the business with a capital of ₹ 21000. After a year, they obtained a profit of ₹ 26,400. By what value does the share of B exceed the share of C ?