It looks like you have entered strings instead of variables in two lines of your code:
- The
calculateTax( )
function call.
- Adding the
tax
variable to the total
.
Try deleting the 'total'
string and replacing it with clicking/pressing the total
key on the coding keyboard instead.
Next, delete the 'tax'
string and then click/press the tax
key on the coding keyboard.
Here is a link to the Bill Helper explainer, if you need further help: