how much tax i have to pay how to file itr

sir, I am in coal transport business. My monthly profit is around 80000 and t i have emi of 26000 for my truck. sir let me tell you my business scenario i buy coal from company about 70k-80k for about 20 ton coal. Then i sell it to the bricks plant at the same amount i purchased and i got only fare about Rs 1300 per ton i.e 1300*20=26000. I spend 11000 for diesel and toll tax, driver xpenditure etc and i have left with around 9k to 10k per trip as a profit. My truck do 8-10 trip per month depend on condition. sir, my question is that i get cheque of around 1 lakh per trip from bricks company but i have to deposit cheque into my bank account for withdrawl after withdrawl i have take my fare from that amount and rest amount i have to give to the coal company. I want to know how much tax i have to pay how to file my income tax. My transation crosses about 8 lakh per month but as profit i get only 80k-100k.What i have to plz clarify