Apply Discount to Prices

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class Solution:
    def discountPrices(self, sentence: str, discount: int) -> str:
        words = sentence.split()
        for i, word in enumerate(words):
            if word.startswith('$') and word[1:].isdigit():
                price = int(word[1:])
                discounted_price = price * (100 - discount) / 100
                words[i] = "${:.2f}".format(discounted_price)
        return ' '.join(words)