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  1. After allowing a discount of 16%, there was still a gain of 5%. Then, the percentage of marked price over the cost price is
    1. 15%
    2. 18%
    3. 21%
    4. 25%
Correct Option: D

Here, r = 16% and R = 5%
∴ Required percentage
= [(r + R)/(100 - r)] x 100%
= [(16 + 5)/(100 - 16)] x 100% = 21 x 100/84% = 25 %



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