Building spreadsheet part 81


I have tried to fix this part. But I don’t know what wrong with my code. Please help me to fix it?

If you have a question about a specific challenge as it relates to your written code for that challenge and need some help, click the Help button located on the challenge. This button only appears if you have tried to submit an answer at least three times.

The Help button will create a new topic with all code you have written and include a link to the challenge also. You will still be able to ask any questions in the post before submitting it to the forum.

Thank you.

you should use the help button, but you do not have an infix variable

thanks a lot. I have fixed it already