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1. A portion of the 7,200 is invested at a 4% annual return , while the remainder is invested at a 5% annual return . If the annual income from both portions is the same, what is the total income from the two investments?
- A. Tk. 166
- B. Tk. 166
- C. Tk. 166
- D. Tk. 166
Answer: Option B
Explanation:
Let the investments be A and (7200 - A) respectively.
Interest, I = P n r
Now, A × 1 × 4/100 = (7200 - A) × 1 × 5/100
or, 4A = 5×7200 - 5A
or, 5A + 4A = 36000
or, 9A = 36000
or, A = 4000
So, total income = A × 1 × 4/100 + (7200 - A) × 1 × 5/100
= 4000×4/100 + (7200 - 4000)×5/100 = 160 + 160 = 320 TK
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