The marked price of a mobile phone was ₹35,600. The shop owner offered a 10% trade discount on the marked price but on further request by the customer, he sold the phone for ₹30,000 after giving a cash discount. How much is this cash discount as a percentage of the price after the trade discount? (Give your answer correct to 2 decimal places.)

6.37%

Marked price = ₹35,600

Price after 10% discount = 35,600 × 90% = 3204

SP of the phone = 3000

Extra discount to be given = \(\frac{(3204 - 3000) × 100}{3204}\) = 6.37%