A plain hamburger (bun and burger) costs $2.00 and toppings cost 25 cents each.  If I spend $5.00 altogether for a hamburger with lettuce, tomato, onion, and cheese  and also an order of french fries, how much do the fries cost?
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For 4th and 5th graders:  If I added pickles to my hamburger and also a cola to my order (including the fries) and my new total is $6.19, how much does the cola cost?