Pune-based Bajaj Auto ltd on Thursday reported a marginal increase in its net profit at Rs739.98 crore for the first quarter ended June 30, 2014 with its executive segment bike brand Discover seeing a steep decline in sales.The company had posted a net profit of Rs737.68 crore in the same quarter last fiscal.Net sales during the period under review stood at Rs5,133.37 crore as against Rs4,808.73 crore in the year-ago quarter, the company said."In terms of our operational profit we are still doing very well.