Final answer:
The cost of one banana is found by dividing the total cost ($0.87) for three bananas by the number of bananas (3), resulting in $0.29 for one banana.
Step-by-step explanation:
To find out how much it costs to buy one banana, we need to divide the total cost by the number of bananas. The total cost of 3 bananas is $0.87, and we want to find the cost for 1 banana. This is a simple division problem.
We divide $0.87 by 3:
$0.87 ÷ 3 = $0.29.
Therefore, the cost of 1 banana is $0.29.
This is an example of using division in operations with money.