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 3 cents, exactly as in the question.
Furthermore, a decimal representation does not imply a change in the measurement units. If this is required then you need to specify the units into which the quantity is to be converted.
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It is already in decimal form so 1.3 cents!
30 cents is already in decimal form: $.30 If you had a dollar it would be $1.00
0.175 cents.
3 nickels in 15/100 so its would be .15
0.59