If the original price is in A1 and the percentage to be added is 17.
then in A2
=A1*1.175
Alternatively if you only want to do this once and just keep the ne
value:
Type 1.175 into any blank cell and copy it. Then highlight the price
to be increased. Use Edit, Past Special, and select Multiply then OK
This will multiply all the highlighted cells by the amount copied