The bar graph in the following graphic represents fictional net exports in billions of dollars for five countries. Net exports are obtained by subtracting total imports from total exports; a negative net export means the country imported more goods than it exported. Net Deports (Billions of dollars) um 'STALO China Spain TOU 100 Notixpatrillions of dollars) Estimate the net amount of exports for Spain. 10 billion dollars b. 30 billion dollars -20 billion dollars d. 20 billion dollars needs help please ​