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A variable ‘x’ varies from 450 to 460 and the other variable ‘y’ decreases from 200 to 190 in a certain period of time. If u = xy then change in u’ during that period is

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$- 2500$

$2500$

$3500$

$- 1500$

answer is A.

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Detailed Solution

x = 450

$δ x = 10$

y = 200, $δ y = - 10$

$u = x y$

$δu = xδy + yδx$

= - 2500.

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