Add financial calculations to examples

[mborland]

Closes: #758

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.7%. Comparing base (b6773e2) to head (7d0fed4).
Report is 9 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #765   +/-   ##
=======================================
  Coverage     98.7%   98.7%           
=======================================
  Files          223     223           
  Lines        16728   16728           
  Branches      1796    1796           
=======================================
  Hits         16504   16504           
  Misses         224     224           

see 1 file with indirect coverage changes

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