How to write 3.020 as a fraction or a mixed number

Answer is 3 1/50. So you take the whole number 3 and put it outside. Now we know that 1/5=.2, so that means that .02= 1/50. Now as a fraction it would be 151/50. You do the denominator times the whole number. Then add the numerator. (3 x 50) + 1= 151. You put 151 on top while leaving the denominator