Data Sufficiency (DS) | From July 1, 1980 to July 1, 1990, the closing price of a share of sto

From July 1, 1980 to July 1, 1990, the closing price of a share of stock X doubled.
that means if on July 1 1980, the value is 10, On July 1 1990 the value will be 20.

S1 says value increased by $2. 2x = x+2;
x=2; implies value on July 1 1980 is 4. Sufficient.

S2 provides no info on value in 1980 or 1990

Ans :A

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