Which of the four scenarios will yield the highest discount?

$$Discount\%=\dfrac{Discount}{Marked\ price}\times\ 100$$

8% discount on marked price ₹400 = > discount = $$400\times \dfrac{8}{100} =$$₹ 32

12% discount on marked price ₹240 = > discount = $$240\times \dfrac{12}{100} =$$₹ 28.8

7% discount on marked price ₹500 = > discount = $$500\times \dfrac{7}{100} =$$₹ 35

10% discount on marked price ₹320 = > discount = $$320\times \dfrac{10}{100} =$$₹ 32

Option C is correct, as the discount in this case is the highest.