Answer:
$3500
Step-by-step 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:
[tex]\[x+\frac{8400}{100}x=297500\][/tex]
=> [tex]\[85x=297500\][/tex]
=> [tex]\[x=\frac{297500}{85}\] [/tex]
=> x= 3500
Hence his collection was worth $3500 in 1999.