What number produces an irrational number when multiplied by 0.4?

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Is 04 the same as 040?

No, 04 = 4 whereas 040 = 40. You usually do not put a zero
before a non-zero number unless you are using a decimal point. If
you meant to use a decimal point, then .04 and .040 are equal
although the latter is considered to be more precise because it is
accurate to 2 decimal places wheras the former is accurate to only
one decimal place.

What is Cardinality of the set?

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