Explanation:

Here’s the thing—let’s break it down step by step:

- For each 'Y' article, cost price = 70% of the marked price.

- Let’s call marked price 'M'. Cost price, CP = 0.7M.

- Profit to discount ratio for Y article: 2 : 1. Call profit ‘P’ and discount ‘D’. So, P = 2D.

- Selling price (SP) = Cost price + Profit = 0.7M + 2D

- Also, SP = Marked Price – Discount = M – D.

Set the two expressions for SP equal:

0.7M + 2D = M – D

0.7M + 3D = M

3D = 0.3M ? D = 0.1M

So, P = 2D = 0.2M.

Revenue from 700 articles = 126,000 Rs.

SP per article = 126,000 / 700 = 180 Rs.

Now, SP = M – D = M – 0.1M = 0.9M.

So, 0.9M = 180 ? M = 200.

Therefore, Discount D = 0.1M = 20

Profit per article P = 0.2M = 40

Profit from 700 articles = 40 × 700 = 28,000 Rs.

So, here’s the final check:

- Option 5, 28,000 Rs.  This is correct.