P owns 2/3 shares of a company and the rest of the shares is equally divided among Q and R. If the profit on each share increases from 5% to 7%, P earns an extra 800 rupees. The investment of R on the shares is
Let total shares of the company be $$6x$$
=> P = $$\frac{2}{3} * 6x$$ = Rs. $$4x$$
=> Q = Rs. $$x$$ and R = Rs. $$x$$
$$\therefore$$ $$4x \times 2\% = 800$$
=> $$4x \times \frac{2}{100} = 800$$
=> $$x = 10,000$$
$$\therefore$$ R's investment = $$x$$ = Rs. 10,000
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