Answer:
$73000
Explanation:
Given: Social security tax paid by Yolanda is $4562.
6.2% tax to be paid on earning to the maximum income of $128400.
Lets assume Yolanda´s income be `x`.
Now, calculating the taxable income of Yolanda
∴

⇒

Cross multiplying both side
⇒ x=

∴x= $73000
∴ Yolanda´s taxable income is $73000.