999.9 * 0.28-6666 * 0.37 simple calculation
999.9*0.28-666.6*0.37
=111.1(9*0.28-6*0.37)
=111.1(18*0.24-6*0.37)
=111.1*6*(3*0.14-0.37)
=111.1*6(0.52-2*3.0.37)=666.6*0.15=99.99
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