Sale of land at higher than guideline value

I sold my land in June 2018 which was bought in the year 1990. I got the land at a  price of 7200. I sold for 34.32.000. Actually, the document was for a value of Rs 45,60,000 and I got the difference in capital gain tax Rs 2,34,624 for the excess amount of Rs 11,28,000 (which I did not receive ) in a different account from one of the relatives of the buyer. I have paid a commission of 1,00,000 to the broker 20000 by cash and 80000 by Fund transfer 

Guideline value as of 1-4-2000 was 44 / sq ft. Present guideline value is 536. Area of the land is 2091 sq ft

How much capital gain tax should I pay and when I should pay this? 

Pl suggest 

Thanks in Advance