Currencies usually default to 2 dp.
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Setting the number of decimal places, in the number format, to 2.
FORMAT / Format Cells / Number tab / Number / 'Decimal places' window / fill in '2'.
If the number is accurate to two decimal places then you write it exactly as in the question.
It then is 3.69 when rounded to two decimal places
The product will have at most 2 decimal places.