I have the answer to the first question, how much does lucy earn as profit and it its £7.04
The average rate would be 2.9 because 20,600 divided by 7000 is 2.9
Well you start by dividing 19779 by 20820 to see the percent of people compared to last year (it being 95%). Then you take 19,779 and multiply it by the same percentage, or 0.95. That means that there should be 18790 (it's technically 18790.1 but since that's people you round to the nearest whole number).
I am not the mathematician