インストール時の標準税率を10%に修正

[nanasess]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.94%. Comparing base (23abd7a) to head (2674e4f).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1126   +/-   ##
=======================================
  Coverage   49.94%   49.94%           
=======================================
  Files          82       82           
  Lines       10480    10480           
=======================================
  Hits         5234     5234           
  Misses       5246     5246           

Flag	Coverage Δ
tests	49.94% <ø> (ø)

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