The following data on capital stock​ (plant, equipment, housing and​ inventory) are available for the Republic of Capika for the year of 2009. Stock of capital on January​ 1, 2009: ​$12 comma 000 billion. Stock of capital on December​ 31, 2009: ​$12 comma 750 billion. From this one can conclude that in​ 2009, the level of net investment ​= ​$ ▼

12,750
12,375
750
12,000 billion.