M Ltd has authorised capital of ₹ 50,00,000 divided into 1,00,000 equity shares of ₹ 50 each. The company issued for subscription 50,000 shares at a premium of ₹ 10 each. The entire issue was underwritten as follows:

A ---- 30,000 shares (firm underwriting ---- 5,000 shares);

B ---- 15,000 shares (firm underwriting ---- 2,000 shares);

C ---- 5,000 shares (firm underwriting ---- 500 shares). Out of the total issue, 45,000 shares including firm underwriting were subscribed. The following were the marked forms:

A ---- 16,000 shares;

B ---- 10,000 shares;

C ---- 4,000 shares. Calculate the liability of each underwriter.