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The following table shows items in the balance of payments accounts for a country (in billions): Balance of trade in goods +20 Balance of trade in services 80 Income balance +40 Net current transfers 10 Capital account balance +20 Net direct investment 50 Balance of other investments and financial flows +60 Reserve assets 20 Calculate: (i) the balance of trade. (ii) current account balance. (iii) financial account balance. (iv) net errors and omissions