Answer:
Find out the what is the constant of proportionality .
To prove
As given
The total amount, a, in dollars, that Mitra earns is a = 14.6h .
The total amount in dollars is represented by a.
the number of hours that Mitra works by h .
As the total amount is depand upon the working hours.
Thus

a = kh
Where k is the constant of proportionality .
Compare this with the equation a = kh with a = 14.6h .
k =14.6
Therefore 14.6 is the constant of proportionality .