GNI = GDP + Net Factor Income from Abroad

Steps:

• Use formula: GNI = GDP + (factor income by residents abroad - factor income by non-residents domestically)
• Identify values: GDP = 100 bn, residents' abroad income = 10 bn, non-residents' domestic income = 25 bn
• Compute net income: 10 bn - 25 bn = -15 bn
• Calculate GNI: 100 bn + (-15 bn) = 85 bn

Why B is correct:

• Per UN definition, GNI equals GDP adjusted by net primary income from abroad (residents' foreign earnings minus non-residents' domestic earnings), yielding 85 bn.

Why the others are wrong:

• A: Subtracts only non-residents' income (100 - 25 = 75), ignoring residents' abroad earnings.
• C: Adds only residents' abroad income (100 + 10 = 110), ignoring non-residents' domestic earnings.
• D: Adds both incomes (100 + 10 + 25 = 135, but choice is 115—still incorrectly includes outflow as inflow).

Final answer: B