The task is to generate the correct answer for a given math problem.

Q: Problem: what is the value of x ^ 2 yz − xyz ^ 2 , if x = − 2 , y = 1 , and z = 1 ?

A: 6
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Q: Problem: if p and q are both odd prime numbers andp < q , then how many different positive integer factors does 2 pqhave ?

A: 8
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Q: Problem: the price of maruti car rises by 30 percent while the sales of the car come down by 20 % . what is the percentage change in the total revenue ?

A:
+ 4 %
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