A man bought $2$ articles for a total of Rs. $3500$. He sold one at a $20\%$ profit and the other at a $10\%$ loss. If the selling prices of both articles are equal, find the cost price of the first article.
Options:
- A: Rs. $1200$
- B: Rs. $1500$
- C: Rs. $1800$
- D: Rs. $2000$
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