I'd use "or" instead of "and", but that doesn't change "at". The first and second ones are good. The third one is bad; all the ats are too much.
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AnonymousPeople tended to look more often at the price of the car than the weight, the taxes, and the design.The phrase "tend to" means tendency and is typically used in present form. The construction is a bit unusual in my opinion. If any thing, I would say " People tend to look at the price of the car more often than the gas milage, maintenace cost a