Answer:
$1900
Step-by-step explanation:
Calculation to determine What amount of interest income is taxable on Charles and Marcia's Year 2 joint income tax return
Using this formula
Taxable interest income=Interest on federal income tax refund+Interest on state income tax refund+Interest on federal government
Let plug in the formula
Taxable interest income=$500 +$600+$800
Taxable interest income=$1,900
Therefore the amount of interest income that is taxable on Charles and Marcia's Year 2 joint income tax return is $1,900