After allowing a discount of 16%, there was still a gain

After allowing a discount of 16%, there was still a gain of 5%. Then, the percentage of marked price over the cost price is

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 %