Correct Answer: INR 57.5

Solution : One quality of rice is sold at = INR 45 per kg
The mixture so formed is worth = INR 50 per kg
Let the rate of second quality be INR $x$ per kg
Ratio = 3 : 2
Let the total quantities of rice = 3 + 2 = 5 kg
$\frac{\text{Total Price of One Quality Rice}+\text{Total Price of Second Quality Rice}}{\text{Total kg Rice}} = {\text{Rate of Mixture}}$
⇒ $\frac{45\times{3}+2x}{5} = 50$
⇒ $135 + 2x = 250$
⇒ $x = 57.5$
$\therefore$ The rate of the second quality of rice is INR 57.5.
Hence, the correct answer is INR 57.5.