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  1. The list price (marked price) of an article is Rs. 900 and is available at two successive discounts of 20% and 10%. The selling price of the article, in rupees, is :
    1. 640
    2. 648
    3. 720
    4. 738
Correct Option: B

Given that , List price (marked price) of an article = Rs. 900

Single equivalent discount for a% and b% = a + b -
a × b
%
100

Here , a = 20 , b = 10%
Single equivalent discount = 20 + 10 -
20 × 10
%
100

Single equivalent discount = (30 – 2)% = 28%
∴  S.P. of article = (100 – 28)% of Rs. 900
⇒ S.P. of article = 72% × Rs. 900
S.P. of article = Rs.
900 × 72
= Rs. 648
100



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