By Danielle Kate Wroe Bananas seem to be perfect, ripe and firm one minute – you blink, and they’ve gone black and mushy. There are still many ways you can utilise them when they’ve gone past their best, such as in banana bread, but if you’re looking to munch them as a healthy snack without wasting your hard-earned cash, Tesco has issued advice on how to keep them fresher for longer. The supermarket advised shoppers to “store the [fruit] right” to make them last longer. A spokesperson said: “Store bananas on their own as the gases they produce will cause other fruit to ripen and spoil more qui…