Simplify this expression and put your final answer in Scientific Notation: 2.7×10^5/3.2×10^7

Step 1: divide the coefficients
Step 2: divide to simplify the exponents
Step 3: add to the exponent
Step 4: 8.44 x 10^-3

is this correct? if so, where is the mistake?

Your Step 4 is correct, but the final answer should be 8.4375 x 10^-3. I apologize for the oversight.