I believe that the common difference would be.10
Hey man just use photo math
Answer:

Step-by-step explanation:
Let
be the original fraction.
If the numerator of a fraction is increased by six, the value of the fraction will increase by one. Hence,

If the denominator of the original fraction is increased by 36, the value of the original fraction will decrease by one. Hence,

Add these two equalities:

Substitute it into the first equation:

Thus, the initial fraction was

Make an equation:
6x + 12 = 268.26
6x = 256.26
X = $42.71
The monthly payment is $42.71
I think the answer is 9...............