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