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The painting's worth in 1991.
Option 1:
Paintings worth was 2$ million in 1997 not sufficient to know .
Option 2:
Over 10 years the price increased by 10% but we don't know anything about price hence not sufficient.

Option 1+2:
It was 2$ in 1997 and it increased by 10% every year so we can trace back and go and find out in 1991.
Bunuel
How much was a certain Rembrandt painting worth in January 1991?

(1) In January 1997 the painting was worth $2 million.
(2) Over the ten years 1988–1997 the painting increased in value by 10 percent each year.


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We need to know the price in 1991
Option 1:
In 1997 it was worth 2$ million not sufficient
Option 2:
Over year it increased by 10% but we don't know the price hence not sufficient.
Option 1+2 gives us the price as well as the increament of price each year hence sufficient .. option C is the answer
Bunuel
How much was a certain Rembrandt painting worth in January 1991?

(1) In January 1997 the painting was worth $2 million.
(2) Over the ten years 1988–1997 the painting increased in value by 10 percent each year.


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How much was a certain Rembrandt painting worth in January 1991?

(1) In January 1997 the painting was worth $2 million.
Only includes info about one data point.
Insufficient

(2) Over the ten years 1988–1997 the painting increased in value by 10 percent each year.
We don’t know the exact price in any year.
Insufficient

(1)&(2)
Growth rate =10% per year and worth in Jan 1997= $2 million
Value in Jan 1991= $2 million/(1.1)^6
It is sufficient to find the answer.
Sufficient

C
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