I can help here.
Because you have a table with a range of values each families expenditure could be you should take the midpoint of each for your calcs. Yuo have 30 families with expenditure from 0-200 so lets give them all $100 as an indicative value.
For the median imagine putting these figures in a line like you usaully would. 100, 100, 100, ...(there are 30 of these!) ...,300, 300, 300 (there are 40 of these!) and so on. This is a terrible job and no one should do it, but the workaround is very simple. Simply add the number of families column together, you get 270? Halfway like the Median suggests would be in between the 135th and 136th number. Now go through that column again finding where this value would live. Once you are there the corresponding right hand column will your answer.
For the mean, using the same idea as just explained it should now be obvious that