Kito selects express shipping and the company bills his credit card $105.69 for the total of the online purchase. determine if kito has been billed correctly for his purchase. a. kito has been billed correctly. b. kito has not been charged enough for his purchase. c. kito has been over charged by $1.85 for his purchase. d. kito has been over charged by $3.40 for his purchase.

The total for the online purchase is $105.59. Assuming that the product is only $99 and the usual charge for express shipping is around 4.9%, so the total for online purchase should be:
$99 (1 + 0.049) = $103.85

Getting the difference from the billed purchase:
$105.69 - $103.85 = $1.84 which is close to $1.85

So, the answer is:
c. Kito has been over charged by $1.85 for his purchase