Concept:Find the balance amount left after the initial payments, then use the interest paid on that balance to determine the original price.
Explanation:Let the original price of the mobile be Rs.
P.
Ramesh paid
61​ of the price by UPI, which is
6P​.
He paid
31​ of the price in cash, which is
3P​.
Total amount paid initially is
6P​+3P​=2P​.
So, the balance amount is
P−2P​=2P​.
Interest was charged at
10% on this balance amount.
Therefore, interest paid
=10%×2P​=20P​.
It is given that the interest paid is Rs.
6,000.
So,
20P​=6,000.
Multiplying both sides by
20, we get
P=6,000×20=1,20,000.
Thus, the original price of the mobile is Rs.
1,20,000.
Answer:Rs.
1,20,000 (Option A).