Part A
Answer: 340
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Add up the values in bold that are in the "total" row or "total" column
For the total row: 200+140 = 340
For the total column: 158+182 = 340
Either way, there were 340 items sold. Note how I'm not including the 60 people who didn't buy anything. So that is why the answer isn't 400.
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Part B
The answer to this part is 62 which can be found in row 1 (the hotdog row) and column 2 (the water column).
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Part C
Answer: 53.5% (approximate)
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We have 182 people who bought pizza out of 340 items sold, so 182/340 = 0.535 approximately which converts to 53.5%