The BMI is given by the formula b(t) = 2, where t is the age of the person, w(t) the weight in kilograms, and h(t) the height in meters. The BMI is usually used as a guideline to determine whether a person is overweight or underweight. For example, according to the Centers for Disease Control, a 12-year-old boy is at risk of being overweight if his BMI is between 21 and 24 and is considered overweight if his BMI is above 24. A 13-year-old boy is at risk of being overweight if his BMI is between 22 and 25 and is overweight if his BMI is above 25. Let b(t) denote the BMI. At age 12, a boy's weight was 45 kilograms and his height was 1.49 meters. Find his BMI and determine whether he is overweight or at risk of being overweight.