Rachel is going to calculate the following expression: 3.32/1.66+18.4. she calculates the expression as it is written and then writes down the answer rounded to the nearest whole number. she then calculates it again, but rounds each of the 3 numbers in the expression to the nearest integer, and then performs the division and addition. she writes this answer down next to the answer she got before. what is the positive difference between the 2 answers she got?