A man invests a certain amount at 6% per annum simple interest and another amount at 7% per annum simple interest. His income from the interest after 2 years was Rs. 348. The ratio of the first amount to the second is 4:5. Find the approximate total amount invested.
Solution
Let the total amount invested be 9x
So the interest for 2 years on 4x amount at 6% per annum simple interest = $$\frac{\left(4x*2*6\right)}{100}$$
the interest for 2 years on 5x amount at 7% per annum simple interest = $$\frac{\left(5x*2*7\right)}{100}$$
Given the sum of these = 348
1.18x = 348 => x$$\simeq\ $$295
So the total amount invested = 2655
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