To solve this question, let's assume the marked price of the radio is x.
According to the given information, the salesman sells the radio at 60% of the marked price. Therefore, the selling price of the radio is 0.6x.
The salesman earns a commission of 3% on the selling price. This commission is given as Rs. 12.
We can set up the equation:
0.03 * (0.6x) = 12
Simplifying the equation:
0.018x = 12
Dividing both sides by 0.018:
x = 12 / 0.018
x = 666.67
Therefore, the marked price of the radio is approximately Rs. 667.
The correct answer is option A.