Create test.py

test.py

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+# Example: Calculate NPV
+import numpy as np
+
+def calculate_npv(cash_flows, discount_rate):
+    return np.npv(discount_rate, cash_flows)
+
+# Example usage
+cash_flows = [-1000, 300, 400, 500]
+discount_rate = 0.1
+npv = calculate_npv(cash_flows, discount_rate)
+print(f"NPV: {npv}")