Final answer:
Selling more products like refinancing a mortgage loan or opening a new checking account helps banks generate revenue and improve profitability.
Step-by-step explanation:
The importance of trying to sell more products such as refinancing a mortgage loan, opening a new credit card, a new checking account, or refinancing an auto loan to a customer that comes into the bank is that it helps the bank generate more revenue and profit.
When people take out loans or open new accounts, the bank earns interest on the money they lend, which is one of the main sources of income for banks. By selling more products, the bank can increase its profitability and stay competitive in the market.