The marked price of a chair was Rs. 19,200. The shopkeeper was offering it for a discount of 20%, but on further bargaining agreed to offer a successive discount and finally sold the chair for Rs. 13,824. What was the second discount offered by the shopkeeper?

Correct option is B

Given:
Marked Price (MP) = Rs. 19,200
First Discount = 20%
Selling Price (SP) after successive discounts = Rs. 13,824
Formula Used:
​$$\text{Price after discount} = \text{Marked Price} \times \frac{100 - \text{Discount}\%}{100}$$​​
Successive discounts are applied one after another.
SP = MP × (1 - d₁) × (1 - d₂)
Solution:
After first discount of 20%:
Price₁ at first discount of 20% = 19200 × (1 - 0.20) = 19200 × 0.80 = 15360
SP after seccond discount = 15360 × (1 - d₂) 
13824 = 15360 × (1 - d₂) 
1 - d₂ = 13824 ÷ 15360 = 0.90
d₂ = 1 - 0.90
d₂= 0.10 = 10%