Find a number that is between 7/11 and 7/10
a. 76/99
b. 23/33
c. 77/99
d. 25/44

So that you would't have a hard time, you can try to use the calculator. 

When you divide 7 over 11, in decimal form you will get 0.63. 
While, 7 divided by 10 will be equal to 0.7. 
What you do now is to see what choice is between 0.63 and 0.7. What I did is to also divide each choices' numerator over the denominator and find that letter B 23/33 is between 0.63 and 0.7 because 23 divided by 33 is equivalent to 0.69.

The answer is that the rate of change is $50 per 1 monthhope this ; )