The selling price per article is Rs. x
The price of the article is Rs (x - 150) more than Rs 150
4% rise from Rs 150 ==> Rs 6
For each Rs 6 increase in price over Rs.150, he sells 3 articles lesser.
So, the reduction in number of articles = (x – 150) / 6 * 3
So, in the new price of Rs.x he sells 100 - (x – 150) / 6 * 3
Or he sells 100 – (x – 150)/2
= (200 – x + 150) / 2
= (350 – x)/ 2
= 175 – x/2
Correct Answer: 175 - x/2