Final answer:
To find the cost of a bunch of 7 bananas, we can use the given information. By multiplying the cost per banana by the number of bananas, we can calculate the total cost. Therefore, the cost for a bunch of 7 bananas is $2.80.
Step-by-step explanation:
To find out how much it would cost for a bunch of 7 bananas, we can use the given information. A bunch of 5 bananas costs $2, so the cost per banana is $2 divided by 5, which is $0.40. We can now calculate the cost for 7 bananas by multiplying $0.40 by 7, which gives us $2.80. Therefore, the cost for a bunch of 7 bananas is $2.80. So, the correct answer is a) $2.80.