How bad are these rust holes?

[arunkayakkal]

I recently bought my first car used up all my savings straight out of school. I bought it because it was low mileage for the year (2011, 120000km) and i asked the seller if there was any rust under it and he said no its beautiful underneath (i know i know shouldve never trusted a used car salesman). Anyway, i made the mistake, bought the car and then after a few weeks i went to another mechanic to change my winter tires to summer tires (they had a sale for tires) and they looked underneath my car and told me that there were two rust holes underneath the car. I was shocked and scared and felt stupid for buying the car. I went back to the guy who sold me the car and he was like of course it has rust its an old car. But those holes doesnt matter you can still drive it. My question is "how dangerous ar3 these holes?" And i can see that they are close to some kind of nuts and bolts thing so is this like a structural damage that will cost a lot to fix.. can i still drive around like this? I bought the car with safety inspection on it and now i feel stupid for believeing .. please check pictures attached