help please. Given a file containing an order. Calculate the total. Append the total in fixed notation with $2$ decimal points, but no $\text{'}$$$\text{'}$ to the end of the file. See the examples zip file for sample orders, as well as the expected answer. On GradeScope, the file will be called $\text{'}./$order$.$dat' make sure that this is how your file is named within your main.cpp programs. The order.dat file is formatted in the following way: NAME$\_$OF$\_$ITEM,QUANTITY,COST$\_$PER$\_$UNIT NAME$\_$OF$\_$ITEM,QUANTITY,COST$\_$PER$\_$UNIT Example order.dat file: Pens $24-$pack,$3,10\mathrm{.}70$ Mead Loos Leaf Paper $(200-$Sheet $3-$pack$),1,9\mathrm{.}22$ Example Answer: Pens $24-$pack,$3,10\mathrm{.}70$ Mead Loos Leaf Paper $(200-$Sheet $3-$pack$),1,9\mathrm{.}2241\mathrm{.}32$ When you are ready, upload your main.cpp file. when uploading main.cpp to grader, there is an error message.