I want to create a simple calculator:
I have these number questions which the user answers:
- Your Fabric cost (per meter)
- Number of metres
- Pattern cost
- Notion cost
- Estimated hours to sew (optional)
- Hourly rate (only if Estimated hours to sew is greater than 0)
The ending that appears on the screen is:
The cost of your sewing project is: (v_total) with a summery of the costs below
v_total = (Your Fabric cost x Number of metres/yards) + Pattern cost + Notion cost + (Estimated hours to sew x Hourly rate)
All optional questions do not require an answer and if they do not have one, then proceed to the next question. Except if Estimated hours is blank then it skips hourly rate and goes to end.
I have created these custom variables, but not sure how to correctly link them to the number questions. I have had a go with logic branching etc...but don’t seem to have it right.

Can someone help me create this in Typeform logic?
Greatly appreciated, Jane