It depends on how big your dogs and burgers are going to be.
Some hot dogs are 10 per pound, so you'd need 500 rolls. Others are 8 per pound, so you'd need 400 rolls.
Same with burgers. They can be 1.6 ounce each (like a regular McDonalds patty) which would figure out to 10 rolls per pound or 600 total. If they are quarter-pounders, you only need 240 rolls.
