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Testing a small cost calculator: decimal inputs, units, and rounding

A calculator can have a correct multiplication and still give misleading results. A parser might silently accept a unit suffix, a percentage might be interpreted on the wrong scale, or an intermediate…

  • Calculator validates input, performs precise calculations with units
  • Handles decimal inputs, rejects whitespace, grouping separators
  • Rounds final cost to two decimal places in EUR 84.74

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