Question

A person invested a total amount of Rs 15 lakh. A part of it was invested in a fixed deposit earning 6% annual interest, and the remaining amount was invested in two other deposits in the ratio 2 : 1, earning annual interest at the rates of 4% and 3%, respectively. If the total annual interest income is Rs 76000 then the amount (in Rs lakh) invested in the fixed deposit was

• A. 7
• B. 9
• C. 8
• D. 6

Answer 1

Answer: (B)

9

Answer 2

Let x represent the amount invested in the fixed deposit.
According to the given stipulation:
= $x\times \frac{6}{100} + \frac{2}{3} \times (15-x) × \frac{4}{100} + \frac{1}{3} × (15-x) × \frac{3}{100} = \frac{76000}{10^5}$

⇒ $6x - \frac{8}{3x} - x = 76 - \frac{8}{3x} \times 15 - 15$

⇒ $\frac{7}{3} x = 76 \times 3 - 11 \times \frac{15}{3}$

⇒ $\frac{7}{3} x = \frac{63}{3}$
⇒ x = 9
Therefore , amount invested in the fixed deposit was 9 lakhs