Answer: The monthly income for d(100000) is $10500.
Step-by-step explanation:
Since we have given that
A real estate agent calculates her monthly income in dollars, using the function :

We need to find out the monthly income for d(100000).
So, in place of x we put the value of x i.e. 100000.
So, our equation becomes,

Hence, the monthly income for d(100000) is $10500.