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Plot (10000 + 20*x) and 0.5*(10000 + 20*x)*ln((10000 + 20*x)/10000), x from 0 to 3200
Plot (10000 + 20*x) and 0.5*(10000 + 20*x)*ln((10000 + 20*x)/10000), x from 0 to 3200
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