If a number is written without a decimal it is usually assumed to be after the last digit.
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.199.
It is simply: 199.0
It is 199 to the nearest whole number.
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. A decimal representation does not require a decimal point. So the required decimal representation is x, exactly as in the question. So the answer is 199.
20% off 199:= 20% discount applied to 199= 199 - (20% x 199)= 199 - (0.20 x 199)= 199 - 39.80= 159.20