Answer:
Rs 6000
Explanation:
To find the original price of the article, we need to reverse the effect of the 30% price reduction. We can do this by dividing the sale price of 4200 by the discounted price of 70%, which is equal to 0.7.
The original price is equal to:
4200 / 0.7 = <<4200/0.7=6000>>6000
So the original price, or the marked price, of the article is Rs 6000.