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0.40 is the same as 40/100 and 0.50 is the same as 50/100.
40/100 x 50/100 = 2000/10000.
2000/10000 can be reduced. Lets start by reducing both sides by 2000.
2000/2000 10000/2000 = 1/5 which is the same as 0.20.
0.40 x 0.50 = 0.20.
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