What is the ruling on working for a company that deals with cash and installment sales, rescheduling checks with added profits, selling checks to banks, and taking interest-based and Islamic loans, and what is the ruling on the salary and bonuses received from it?

Working for a car trading company is originally permissible, but rescheduling checks with an increase and selling some of them to banks is forbidden. If your work has no connection to forbidden acts, there is no blame upon you for cooperating with the company nor for the wages or rewards you earn from it. Merely extracting comprehensive reports for forbidden transactions does not make your work forbidden, because those transactions have already occurred, and there is no intentional assistance in that.