numerical math problem

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How to divide Rs.10,000 to four persons proportionately? ( let's say A invested Rs 3,200 B Rs 5,700 C Rs 8400 and D Rs 9,900 respectively.

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Let the individual investments be $x_A$, $x_B$, $x_C$ and $x_D$. The total investment is $x_A+ x_B+x_C+x_D$.

So Investor A's fraction is $f_A=\frac{x_A}{x_A+ x_B+x_C+x_D}$ and likewise for the other investors.

Multiply $10000 by each of the fractions to determine the amount each of them is owed.