Decide which of the two given prices is the better deal and explain why.
You can buy shampoo in a ​6-ounce bottle for ​$3.49 or in a ​15-ounce bottle for ​$9.59.
Round to the Nearest cent as needed.

I got $1.72 (rounded) per ounce for the 6-ounce bottle and $1.56 per ounce for the 15-ounce bottle, and answered that the 15-ounce bottle was the better deal, but it still says my answer is incorrect