def calculate_bmi(weight, height)
  bmi = weight / height ** 2
  if bmi < 18.5
    category = "Underweight"
  else
    if bmi < 25
      category = "Normal"
    else
      if bmi < 30
        category = "Overweight"
      else
        category = "Obese"
      end
    end
  end
  return "BMI: #{bmi}, Category: #{category}"
end
print(calculate_bmi(70, 1.75), "\n")
print(calculate_bmi(90, 1.80), "\n")
print(calculate_bmi(50, 1.65), "\n")