How can I use previous answers to calculate answer possibilities in the future?

I am new to this, but despite search and a look at the documentation, I am still lost with the following questions.
How can I use I previous response in a following question and do some calculations with it. For example:
Question 1: How much would you be willing to pay for a cup of coffee? Answer: 4 €.
Question 2: How likely is it that you buy a cup of coffee if it costs $answer$*110%?
Question 3: Chose the price that you paid last time you bought a cup of coffee. Options “Answer Q1 +1”, “Answer Q2 +2”, “Answer Q1 -1”, “Answer Q2 -2”

Thanks a lot!

Welcome to the community, @test! Maybe this is what you are looking for …

In the survey tab of your XLSForm:

In the choices tab of your XLSForm:

Image 2

Data entry screen as seen in Enketo:

Reference XLSForm:

Auto Options.xlsx (13.3 KB)

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