Two successive discounts, each of x% on the marked price of an article, are equal to a single discount of ₹331.20. If the marked price of the article is ₹920, then the value of x is:

20

Single discount = ₹331.20

Marked price of the article = ₹920

Percentage of discount = \(\frac{331.2 × 100}{920}\) = 36%

We know that 36% is the single discount when two successive discounts of 20% is given.