630
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Three quarters of 840 is calculated by multiplying 840 by 3/4, which is equivalent to 0.75. This can be done by multiplying 840 by 0.75, resulting in 630. Therefore, three quarters of 840 is 630.
31.5 (get 1/10 of 840, then get 3/4 of that, then get 1/2 of that)
0.0036
3 quarters add 3 quarters = 6
2520