No.
740 → 7 + 4 + 0 = 11
11 → 1 + 1 = 2 which is not one of 3, 6, 9 so 740 is not a multiple of 3.
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0.027
It is then 740 when rounded to the nearest ten.
8 x 740 = 5920
740
740 is an integer and there is not a sensible way of representing it as a fraction. 740/1 is a silly, but mathematically correct answer.