A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. Assuming that the number 400 is in base 10 then it is a decimal equivalent. If it is in any base other than 10 then it is not a decimal.
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25 over 400 as a decimal = 0.062525/400:= 25 ÷ 400= 0.0625 in decimal
Fraction . . . 400/1 Decimal . . . 400.000
400% = 4.0 in decimal = 4/1 in fraction
0.3175 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 3175/10000 which simplifies to 127/400.
50/400 = 0.125