Discussion

Explanation:

Net %change = 50 – 50 + $\frac{50\times -50}{100}$ = -25 = -25%

Alternately,

When a quantity is increased by p% and then successively decreased by p%, net change is $-\frac{p^2}{100}$.

Here, net change = -50²/100 = -25%.

Hence, option (a).

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