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The answer would be c
4.378 is near to 4.400
and in mathematics zero after decimal can be ignore,
4.400 is same is 4.4
also 4.300 is same as 4.3
since 4.378 is less than 4.400, but more than 4.300
Thus, 4.378 is between 4.3 and 4.4
550,000 is the rounded answer