Question : What is the selling price of a dress that has a marked price of Rs. 500 and is given a 20% discount and subsequently a 10% discount?
Option 1: Rs. 330
Option 2: Rs. 360
Option 3: Rs. 365
Option 4: Rs. 345
Correct Answer: Rs. 360
Solution :
Given: Marked price = Rs. 500
1st discount($x$) = 20%
2nd discount($y$) = 10%
$\therefore$ Effective discount = $x + y - \frac{xy}{100}=20 + 10 - \frac{200}{100}= 28\%$
Now, the selling price = $500×\frac{100-28}{100}$ = Rs. 360
Hence, the correct answer is Rs. 360.
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