calculate the value added by firm A and B from the following data.

purchase by firm A from rest of the world =30
sales by firm B =90
purchases by firm A from firm B = 50
sales by firm A= 110
export by firm A =30
opening stock of firm A = 35
closing stock of firm A =20
opening stock of firm B =30
closing stock of firm B =20
purchases by firm B from firm A= 50

Firm A

Sales = 110
Purchases = Purchases from firm B + Purchases form rest of the world
                  = 50 + 30 = 80
Change in stock = closing stock - opening stock
                          = 20 - 35 = 15

Value added by firm A = (Sales + Change in Stock) - Purchases
                                     = 110 + (-15)- 80 = 15

Firm B

Sales = 90
Purchases = Purchases from firm A = 50
Change in stock = closing stock - opening stock
                          = 20 - 30 = -10

Value added by firm B = (Sales + Change in Stock) - Purchases
                                     = 90 + (-10) - 50 = 30
 

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