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Plot[{0.25*(100/(100+( x*0.76-18 ))), 0.15*(100/(100+( x*0.76-18-15 ))), 0.2*100/148}, {x, 0, 325}]
Plot[{0.25*(100/(100+( x*0.76-18 ))), 0.15*(100/(100+( x*0.76-18-15 ))), 0.2*100/148}, {x, 0, 325}]
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