He is a very shrewd person; he calculates amount mentally, much faster than you might with the help of calculator. By evening, you might forget how many cups of tea you had gulped that day, but he won’t, not even after a week. Pappu is illiterate, but he knows how to run a business: the customer is the king and a satisfied customer always comes back again. He knows how to maintain a long lasting relationship based on loyalty. He gives equal attention to each and every customer. He participates in all the discussions, even debates with his customers, and sometimes may even take you by surprise - he might know more than you. While the conversations take place, he jots down the accounts of his regular customers who deal with him on credit in a diary which he keeps handy.