Charitable trust having a business

dear sirs
we are running a charitable trust . we have doing a business in the name of charitable trust and sales tax return also filed. the income from business is used for charitable purpose . the business has gross turnover of Rs.1.4 crore and net profit of 80000. is the business is liable for tax audit? which itr to be filled ? ITR 7 or ITR 4? audit report under section 44 ab and 10 b is required ? in computation how gross receipts of the trust to be shown? gross income of the trust & profit of the business to be shown in gross income ? please help me its very urgent