Explanation:

GIVEN: Total Revenue from Operations Rs 15,00,000; Cost of Revenue from Operations Rs 9,00,000 and Operating Expenses Rs 2,25,000

operating ratio = cost of revenue from operation + operating expenses * 100

                                    revenue from operations

                          = Rs.9,00,000 + Rs. 2,25,000 * 100 

                                    Rs. 15,00,000

                          = 75%