Explanation:

- B buys 15 kg of apples using a 950 grams weight as a kilogram, effectively getting a total of $\frac{950}{1000}\times 15=14.25$ real kilograms.

- This purchase costs B $(14.25\times 180=2,565)Rupees$.

- B sells using a weight of 750 grams per "kilogram", converting his 14.25 real kg into $(\frac{1000}{750}\times 14.25=19)kg$.

- B sells 19 kg at 180 Rupees per kg, making $(19\times 180=3,420)Rupees$.

- The profit earned is $(3,420-2,565=855)Rupees$.

- The percentage profit is $\frac{855}{2,565}\times 100=33.33\mathrm{\%}$.

- Option: 3 - 33.33%