If we take an arbitrary value for j = 20.

Assuming the store's monthly sales for October to be 1000.

Hence, the sale in November is 800.

If the sales in December was the same as that of October,

we would need an increase of 200, and the increase will be \(\frac{200}{800}*100 = 25\)%

When we substitute the value of j=20,

Option D(\(\frac{100j}{100-j}\)) gives the correct answer

abansal1805 IMO the OA must be D, not C. Please check!

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