A man sold an article for Rs. 221, there by gaining 10.5%. The cost of the article (in Rs.) was:

Correct option is C

Given:
Selling price (SP) = Rs. 221
Gain % = 10.5%
Formula Used:
​$$SP = CP \times \frac{100 + \text{Gain\%}}{100}$$​​
Solution:
​$$CP = \frac{221 \times 100}{110.5} \\\ \\= \frac{221 \times 100}{110.5}\\\ \\\\\ \\= \frac{221}{1.105}\\\ \\= 200\\\ \\$$​​
So, cost price = Rs. 200.
Alternate Solution:
SP : CP = 100 + 10.5 : 100 = 110.5 : 100 = 221 : 200, so CP = 200.