200.5*10%+2.005*490+0.2005*5000 = 200.5*0.1+2.005*490+0.2005*5000 = 20.05*1+20.05*49+0.20.05*50 = 20.05*(1+49+50) = 20.05*100 = 2005 3333*3333+9999*8889= 3333*3*(1111)+9999*8889= 9999*(1111)+9999*8889= 9999*(1111+8889)= 9999*(10000)= 99990000
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