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Solution

Correct Option: 4

70%70\% of 420=70100×420=294420 = \frac{70}{100} \times 420 = 294. 30%30\% of 280=30100×280=84280 = \frac{30}{100} \times 280 = 84. Sum = 294+84=378294 + 84 = 378.

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