def calculate_bmi(weight, height):
    bmi = weight / (height ** 2)
    
    if bmi < 18.5:
        category = "Underweight"
    elif bmi < 25:
        category = "Normal"
    elif bmi < 30:
        category = "Overweight"
    else:
        category = "Obese"
    
    return f"BMI: {bmi}, Category: {category}"

# Test
print(calculate_bmi(70, 1.75))
print(calculate_bmi(90, 1.80))
print(calculate_bmi(50, 1.65))