How to calculate tidal volume for case study?

A 150 lb., 62-year-old man had a chronic productive cough, exertional dyspnea, mild cyanosis, and marked slowing of forced expiration. His pulmonary function and laboratory tests follow:

Frequency    16 breaths/min
Alveolar ventilation    4.2 L/min
Vital capacity (VC)    2.2 L
Functional residual capacity (FRC)    4.0 L
Total lung capacity (TLC)    5.2 L
Forced Vital Capacity (FVC)   3.5 L
Forced Expiratory Volume (FEV1)   1.5 L
PaO2    62 mm Hg
PaCO2    39 mm Hg
Pulmonary function tests after bronchodilator therapy:
Frequency    16 breaths/min
Alveolar ventilation    4.35 L/min
VC    2.4 L
FRC    4.0 L
TLC    5.2 L
FVC        3.8 L
FEV1   2.0 L
PaO2    62 mm Hg
PaCO2    38 mm Hg

7.  Calculate the tidal volume (TV) for this person before and after the bronchodilator therapy.

- I've seen the same exact post floating around this forum but it doesn't state how to calculate tidal volume. Please help if you can.