3pounds of gummy bunnies are selling for $4.00. how much will 2 pounds cost?

Most of the required important information's are already given in the question. Based on those given information's the answer to the question can be easily reached.
The cost of 3 pounds of gummy bunnies = $4
Then
The cost of 1 pound of gummy bunnies = (4/3) dollars
So
The cost of 2 pounds of gummy bunnies = (4/3) * 2 dollars
                                                                   = 8/3 dollars
                                                                   = 2 2/3 dollars
                                                                   = 2.67 dollars
So the cost of 2 pounds of gummy bunnies is 2 2/3 dollars or $2.67. I hope the procedure is simple enough for you to understand.