3. In 1991 AT&T, the largest long-distance telephone operator in the U.S., paid $7.5 billion to acquire NCR, a computer manufacturer. Prior to the acquisition, the book value of NCR's assets was $4.5 billion, and its liabilities were $1.5 billion. Assuming that there was little significant difference between the fair value and the book value of NCR's assets, show the effect of the acquisition on AT&T's balance sheet from using (a) the pooling of interests method and (b) the purchase method.