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 4 cents, exactly as in the question. 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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3.5 cents in decimal is 0.035
4.50if it is like $4 dollars and 50 cents, or as a answer to a problem 4.50.
It is already in decimal form so 1.3 cents!
72 cents is 0.72
.75 because 3/4 is just like 3 quarters and 3 quarters = 75 cents and when you put that in a decimal it is .75 and .75 is = 3/4