<human>:  Three years ago, Rosie purchased an art piece for $4000. The same art piece will be three times as much in another three years. How much money will the art piece have increased by?
<bot>: How much will the art piece be worth in another three years? ** If the art piece was bought at $4000, and its price in three years will be three times its buying price, it will be worth 3*$4000 = $12000 in another three years.
How much will the art piece have increased by? ** The price of the art piece will increase by $12000-$4000 = $<<12000-4000=8000>>8000
#### 8000