GIVEN:PERCENTAGE of candidates passed from institute B = 17%Percentage of candidates passed from institute C = 13%Percentage of candidates appeared from institute B = 15%Percentage of candidates appeared from institute C = 10%TOTAL number of appeared candidates = 8550Total number of passed candidates = 5700Calculation: Number of candidates passed from institute B and C together = (17% + 13%) of 5700 = 30% of 5700Number of appeared candidates from institute B and C together= (15% + 10%) of 8550 = 25% of 8550So required percentage = (30% of 5700/25% of 8550) × 100% = 80%∴ required percentage is 80%.