def simulate_calculate_rate(executions, failures):
    if executions == 0:
        return 0
    return (failures / executions) * 100

if __name__ == "__main__":
    print("--- Test 1: Healthy Skill ---")
    r1 = simulate_calculate_rate(100, 2)
    print(f"Rate: {r1}%")
    status1 = "PASS" if r1 == 2.0 else "FAIL"
    
    print("\n--- Test 2: Failing Skill (Threshold Breach) ---")
    r2 = simulate_calculate_rate(50, 25)
    print(f"Rate: {r2}%")
    status2 = "PASS" if r2 == 50.0 else "FAIL"
    
    print("\n--- Test 3: Zero Execution Grace ---")
    r3 = simulate_calculate_rate(0, 0)
    print(f"Rate: {r3}%")
    status3 = "PASS" if r3 == 0 else "FAIL"
    
    print(f"\nFinal Status: {'PASS' if all(s == 'PASS' for s in [status1, status2, status3]) else 'FAIL'}")