NVA at factor cost is NDP at factor cost = 540.
NNP at factor cost = NNP at MP - Net Indirect Taxes = 550 - 30 = 520.
NNP at FC = NDP at FC + Factor Income from Abroad (FIFA) - Factor Income to Abroad.
520=540+FIFA−50
FIFA=520−540+50=30.
Hence factor income from Abroad = Rs.30 Crore.