<human>:  Bert has a garden shop. He buys his products in a warehouse and sells them for $10 more in his shop. From each sale, he has to pay 10% of the value in tax. One day a client came to his shop and bought a barrel for $90. How Much money did Bert make on this sale?
<bot>: How much did Bert pay for the barrel in the warehouse? ** First, we need to know how much Bert paid for the barrel in the warehouse, and that is 90 - 10 = $<<90-10=80>>80.
How much tax does Bert have to pay? ** The tax from the sale stands at 10/100 * 90 = $<<10/100*90=9>>9.
How much money did Bert make on this sale? ** That means Bert earned 90 - 9 - 80 = $<<90-9-80=1>>1 on the sale.
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