ATQ, Total marks scored: A scored 170 marks in total. C scored 150 marks in total. Maximum marks for all three tests combined = 80 + 80 + 100 = 260. Percentage for A = (170 ÷ 260) × 100 = 65.38%. Percentage for C = (150 ÷ 260) × 100 = 57.69%. Difference = 65.38% - 57.69% = 7.69%.
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