A shopkeeper offers 3 discount schemes to his customers. Which of the following schemes will provide the minimum discount percentage?
* A) Two successive discounts of $24\%$ and $27\%$.
* B) Buy 5, get 3 free.
* C) Buy 6 and get 10.

To determine which scheme gives the minimum discount percentage, let's evaluate each scheme:
**Scheme A: Successive discounts of $24\%$ and $27\%$ **

$$\text{Effective Discount}=\left(24+27-\frac{24\times 27}{100}\right)\%=(51-6.48)\%=44.52\%$$

Scheme B: Buy 5, get 3 free
The customer gets $3$ free articles out of a total of $5+3=8$ articles.

$$\text{Discount Percentage}=\left(\frac{3}{8}\times 100\right)\%=37.5\%$$

Scheme C: Buy 6 and get 10
This means the customer pays for $6$ articles but receives a total of $10$ articles, implying $10-6=4$ articles are free.

$$\text{Discount Percentage}=\left(\frac{4}{10}\times 100\right)\%=40\%$$

Conclusion:
Comparing the percentages: Scheme A ($44.52\%$), Scheme B ($37.5\%$), and Scheme C ($40\%$). Scheme B offers the minimum discount percentage.