Answer:
$613.35
Explanation:
As 1.45% of employee's pay check goes to the Medicare, so 
Total pay of Kasey in next year=$42300 
Amount to be paid to medicare=1.45% of Kasey^' s pay 
=42300* 1.45/100 
=42300* 145/10000 
= 6133500/10000 
=613.35 
Kasey will have to pay $613.35 to Medicare.