Every person has at some point in his life, spent some money on bananas and a week after that they have eaten only one. They toss the rest in the garbage because they had gone bad.
Bananas are actually good to eat in a very short period of time. Vijaya Selvaraju is a YouTube user, and in one video she demonstrates how to prevent the banana from going bad, using just a plastic wrap.
First, you need to separate the bananas from the stem. Then you need to wrap each tip with a plastic wrap individually, and make sure that it is tightly secured.
Covering the stems prevents the ethylene gas from releasing. Ethylene gas causes the bananas to ripen quickly.
She does it in the following way: