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Compute counts from percentages. Candidate A: 0.40×200=800.40 \times 200 = 80. Candidate B: 0.35×200=700.35 \times 200 = 70. The remainder goes to C: 200−80−70=50200 - 80 - 70 = 50. The difference A vs. C: 80−50=3080 - 50 = 30, so choice C. A frequent GRE trap is to misread “the rest” or to round mid-calculation. Because totals here are clean multiples of 100, stick to exact integers. Another speed tactic: since percentages sum to 75% for A and B, C must be 25%. Then A (40%) minus C (25%) is 15% of 200 → 0.15×200=300.15 \times 200 = 30. This proportional shortcut avoids extra arithmetic. Always verify that category percentages add to 100%; if not, infer the missing share from the remainder. In data interpretation, translating percentages to counts and back is essential—maintain precision, reduce fractions when helpful, and check the logic of complements (“rest,” “others,” “remaining”) to avoid oversight.