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Answer

a)
(A + B + C)/3 = (A + B)/2 + 400
2A + 2B + 2C = 3A + 3B + 2400
a + B = 2 x 4000 – 2400 = 5600

(b)
5600 + 4000 = 9600

Ans : (a) $5600 and (b) $9600.

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