P/l of sale of fixed assest

First, you have to identify what policy the company is following: cost or revaluation model. From the above information it looks like assets are valued at cost. So, the book value referred to here is also the market value of the asset. So, I remember disposal of non current assets are measured at lower of carrying amount/book value or FVLCD. Here, Cost is lower. Then the entries are as follows:

Bank a/c 18,000₹

To Asset disposal a/c 14,000₹

To gain on disposal a/c 4,000₹