Calculate take-home pay after tax deductions. Formula: Net Pay = Gross Pay - (Gross Pay × Tax Rate / 100)

Examples:

Input: grossPay = 2000, taxRate = 20
Output: 1600
Explanation: 2000 - (2000 × 20/100) = 1600

Input: grossPay = 1000, taxRate = 15
Output: 850

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