Answer:
The interest charged is $7.49. 
After 29 days, Travis paid a total of $607.49
Step-by-step explanation:
Travis obtained a cash advance for $600. 
The interest rate is 0.04305% per day. 
The simple interest rate formula is given by: 

Where <em>I</em> is the interest, <em>P</em> is the initial amount, <em>r</em> is the rate, and <em>t</em> is the time (in this case in days). 
Our initial amount <em>P</em> is $600. 
Our interest rate <em>r</em> is 0.04305% or (moving the decimal two places to the left) 0.0004305. 
Since Travis repaid the loan after 29 days, our <em>t</em> is 29. 
Hence, our interest is: 

So, the interest charged is about $7.49. 
So, after 29 days, Travis paid a total of the original $600 plus an interest of $7.49 for a total of $607.49