Calculate operating profit ratio under the following cases.
Case 1: Revenue from operations Rs. 8,00,000, Operating profit Rs. 2,00,000.
Case 2: Revenue from operations Rs. 20,00,000, Operating cost Rs. 14,00,000.
Case 3: Revenue from operations Rs. 10,00,000, Gross profit 25% on revenue from operations, Operating expenses Rs. 1,00,000.