Format Percent with NumberFormat

Use Java's NumberFormat class to read a decimal ratio and print it as a percentage with exactly one decimal place.

Expected Output:
Rate: 37.5%

Create a percent formatter with NumberFormat.getPercentInstance(), then set both min and max fraction digits to 1. The formatter multiplies your decimal by 100 and appends % automatically.

⚠️ AUTO-INPUT MODE: The input stream will automatically contain '0.375\n'. Use Scanner's nextDouble() to read it - no keyboard input is needed.

Expected Output:

Rate: 37.5%

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