Answer:
Cash advance fee
$4.00 
(200 x .02 = 4) 
 
Interest for one month at an 18 percent APR 
$3.00 
(200 x .18 x 1/12 = 3) 
 
 The total amount she paid
$207 
(200 + 4 + 3 = 207) 
 
If she had made the purchase with her credit card and paid off her bill in full promptly = $200