A warehouse is tasked with sorting 1,560 packages per day. Male and female workers are employed for this job, with each worker working 8 hours per day. A male worker can sort 25 packages per hour, and a female worker can sort 30 packages per hour. Male workers receive a fixed wage of Rs. 300 per day and Rs. 12 per package sorted, while female workers receive a fixed wage of Rs. 350 per day and Rs. 10 per package sorted. How many male workers should the warehouse employ, given that it must employ at least 3 and at most 7 female workers, and what will be the total operational cost per day with the given condition?