It has to be greater than the difference between the two sides, so 97-14=83
Using the average daily balance method, the amount to be used in calculating Theresa's interest is given by:

Therefore, the interest charge on Theresa for the biling cycle is given by:
There would be a 13 dollar tip if you round it. If you didn't it would be 13.05.
First you would turn the percent into a decimal. You would do this by moving the decimal place to the left 2 places. Then, multiply that by your amount.