Answer:
a. Mike's gross income is $6,500
Explanation:
Since Mike contracted with Kram company as was a medical doctor. His duty is to perform an operation for Rosa for which the corporation has paid him $6,500 to perform the operation
So, in the given case, the gross income is $6,500 as he actually received this amount for service rendered by him, not the $8,000 contracted by the corporation
The amount which is to be received should come under the gross income