Variable calculation, withing a Roster, that performs 1 out of multiple calculations based on prior single select selection

Syntax
1

Hello,
For our questionnaire’s income section, we use a roster for income sources

Example of multiselect list source question:
Variable name - IncomeSource
1 Income from salaries
2 Income from own enterprise
3 Rental Income from land lease
4 Pensions from employer

Roster ID - IncomeSourceList
Roster: Personal Income - %rostertitle%

Variable name - Q1 (cat.single-sel.)
Has John Doe received payments from %rostertitle%, in the past 12 months?

  1. Yes
  2. No

Variable name - Q2 (numeric)
If Yes, what was John Doe’s total %rostertitle% received, in the past 12 months?

Variable name - Q3 (cat.single-sel.)
How often did John Doe receive %rostertitle%, in the past 12 months?

  1. Daily
  2. Weekly
  3. Every two weeks/fortnightly
  4. Monthly
  5. Quarterly
  6. Yearly

Were, for instance, a respondent to select
*‘Income From salaries’, and
*‘Pensions from employer’
in the multi-sel. source question (IncomeSource), the roster questions would look like so:

Personal Income - Income From salaries
Q1 (cat.single-sel.)
Has John Doe received payments from Income From salaries, in the past 12 months?

  1. Yes
  2. No

Q2 (numeric)
If Yes, what was John Doe’s total Income From salaries received, in the past 12 months?

Q3 (cat.single-sel.)
How often did John Doe receive Income From salaries, in the past 12 months?

  1. Daily
  2. Weekly
  3. Every two weeks/fortnightly
  4. Monthly
  5. Quarterly
  6. Yearly

Personal Income - Pensions from employer
Q1 (cat.single-sel.)
Has John Doe received payments from Pensions from employer, in the past 12 months?

  1. Yes
  2. No

Q2 (numeric)
If Yes, what was John Doe’s total Pensions from employer received, in the past 12 months?

Q3 (cat.single-sel.)
How often did John Doe receive Pensions from employer, in the past 12 months?

  1. Daily
  2. Weekly
  3. Every two weeks/fortnightly
  4. Monthly
  5. Quarterly
  6. Yearly

Still within the IncomeSourceList roster, we’d need to perform a calculation whose output changes based on which what they select in Q3.

For instance, going with the same selections of
*‘Income from salaries’, and
*‘Pensions from employer’

For ‘Income from salaries’, were they to give the amount 100 in Q2 and select Daily in Q3, the variable would calculate
Q2365 = 100365 = 36,500.

whilst for ‘Pensions from employer’, were they to give the amount 4000 in Q2 and select Quarterly in Q3, the variable would instead calculate
Q24 = 40004 = 16,000

and so on for the other Q3 selections
Weekly: Q252
Fortnightly: Q227
Monthly: Q212
Yearly: Q21

The reason we’d like them all to be contained within the same variable that dynamically switches the calculation based on the Q3 selection, is because, outside of the roster, I would like to perform the following calculation to sum all instances of that variable within the roster:
Variable name: total_income
IncomeSourceList.Sum(x=>x.CalculationVariable)