30 cents is already in decimal form: $.30
If you had a dollar it would be $1.00
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30% written in decimal form is 0.30
30 and 20 hundredths in decimal form is written as 30.20. In this form, the whole number 30 is followed by the decimal point, and the fractional part 20 hundredths is expressed after the decimal point. This represents the number 30.20 in decimal form.
0.30
thirty hundredths
Expressed as a decimal fraction, 30/1000 = 0.03.