billing for Retailers

For small dealers if the amount of invoice is less than Rs. 200 then no need to issue the invoice. He should prepare a invoice of aggregate amount of the supply of goods below Rs. 200 in one day. If the amount of invoice exceeds Rs. 200 then it is mandatory to raise invoice

But it is very difficult (not impossible) for medium retailer with turnover around 80 lakhs. then he has to arrange computer and give printed bills. any solution for this?