Answer:
$3500
Explanation:
Gary V's basketball card collection is currently worth $297,500.
It has increased by 8400% since he completed it in 1999.
Let the original value of his collection in 1999 be x.
Then, as per the given information:
![\[x+(8400)/(100)x=297500\]](https://img.qammunity.org/2020/formulas/mathematics/high-school/7t7uwjhsyo7ol9kr3l0f66dpxoqcghau0y.png)
=>
![\[85x=297500\]](https://img.qammunity.org/2020/formulas/mathematics/high-school/s00gpjpb6kwl2jmsj2ag4yl2ie2kwvcg2o.png)
=>
![\[x=(297500)/(85)\]](https://img.qammunity.org/2020/formulas/mathematics/high-school/8rb2m7fkwt68wp4exbmdlpkweytnv6a2z1.png)
=> x= 3500
Hence his collection was worth $3500 in 1999.