STEP 1: Write down the percent divided by 100 like this :
0.003% = 0.003/100
STEP 2: Multiply both top and bottom by 10 for every number after the decimal point: As we have 3 digits after the decimal point, we multiply both numerator and denominator by 100, or, simplify shift 3 decimal places to the right. So, 0.003/100 = (0.003 * 1000) / (100 * 1000) = 3/100000
