What is the opposite of +50?

Algebra Level 2

Muthu the shopkeeper was having a hard time making enough profit in his store, so he decided to increase his prices, and declared to his employees “Raise all prices by 50%!”.

But instead of increasing his revenue, this just caused all of his customers to abandon him, and now he's making no profit at all. He wants to reverse his decision, and declares to his employees “I've changed my mind. Cut all prices by 50%!”.

What is the net effect of these two decisions?

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