Correct Answer - Option 1 : Rs. 10000

**Given:**

Rate (R) = 8%

Time (T) = 9 years

**Formula used:**

S.I. = (P × R × T)/100

Where, S.I. → Simple Interest

P → Principal

R → Rate

T → Time

**Calculations:**

Let the amount lent be Rs. P.

According to the question,

S.I. = (P × R × T)/100

⇒ (P × 8 × 9)/100

⇒ S.I. = 72P/100

So, (P – 72P/100) = 2800

⇒ P = 10000

**∴ The required sum is Rs. 10000.**