Mr. Rahman invests Tk. 2,400 in a bank at 5% interest. How much additional money must he invest at 8% interest so that the total annual income will be equal to 6% of his entire investment?

Created: 4 weeks ago | Updated: 4 weeks ago

Job Solution Shahjalal Islami Bank Ltd Shahjalal Islami Bank Ltd. || Trainee Senior Officer (30-11-2018) || 2018 গণিত

Let, Tk. X is the additional money Mrs. Barbara invests at 8% interest

∴ Her total investment = (x + 2,400) Tk.

According to the question,

$(2, 400 \times 5 %) + (x \times 8 %) = (2, 400 + x) \times 6 % \Rightarrow 120 + \frac{8 x}{100} = (2400 + x) \times \frac{6}{100} \Rightarrow 120 + \frac{8 x}{100} = 144 + \frac{6 x}{100} \Rightarrow \frac{8 x}{100} - \frac{6 x}{100} = 144 - 120 \Rightarrow \frac{2 x}{100} = 24 \Rightarrow \frac{x}{50} = 24$

$∴ x = 1200$ টাকা ans.

4 weeks ago

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Mr. Rahman invests Tk. 2,400 in a bank at 5% interest. How much additional money must he invest at 8% interest so that the total annual income will be equal to 6% of his entire investment?

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