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18.9x(178+0.178)
=(20-1.1)x178.178
=20x178.178-1.1x178.178
=3563.56-(1+0.1)x178.178
=3563.56-(178.178+17.8178)
=3563.56-195.9958
=3367.5942
=(20-1.1)x178.178
=20x178.178-1.1x178.178
=3563.56-(1+0.1)x178.178
=3563.56-(178.178+17.8178)
=3563.56-195.9958
=3367.5942
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