Let the price in year 1970 be \(x\) and in 1989 be \(y\).
Given relation: \(y=3.56x\)
We have two equation and two variables. Hence x, or price in 1970, can be found out. Sufficient.
Since \(x=y/3.56\), hence x, or price in 1970, can be found out. Sufficient
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