He bought 2 dogs for $250.00 each so they costs 2*250 = $<<2*250=500.00>>500.00
He sells each of the 6 puppies for $350.00 so he'll make 6*350 = $<<6*350=2100.00>>2,100.00
He made $2,100 on the puppies but spent $500.00 to buy the dogs so his total profit is 2,100-500 = $<<2100-500=1600.00>>1,600.00
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