Question

P and Q start a business with initial investment Rs.5000 and Rs.4000 respectively. After ’t’ years Q adds 25% of what he invested initially and another person R joins the business with them with initial investment Rs.7000 and after 5years from the start of the business P adds Rs.1000 more to his capital. If at the end of 8 years total profit from the business is Rs.11900 while share of Q is Rs.3750, what is the share of R in the profit.

• A. Rs 4250
• B. Rs 3850
• C. Rs 4050
• D. Rs 4850

Answer 1

Answer: (B)

Rs 3850

Answer 2

The correct option is (B): Rs 3850.
Ratio of their profit = [5000 * 5 + 6000 * 3]: [4000 * t + 5000 * (8 - t)]: [7000 * (8 - t)]
Let total profit = [5000 * 5 + 6000 * 3] + [4000 * t + 5000 * (8 - t)] + [7000 * (8 - t)]=[139000 - 8000t]
Share of Q in the profit = [4000 * t + 5000 * $\frac{(8 - t)]}{[139000 - 8000t]}$ $\frac{(8 - t)]}{[139000 - 8000t] }$= $\frac{3750}{11900}$
$\frac{(160 - 4t)}{(1390 - 80t)}$ = $\frac{15}{119}$
119(160 - 4t) = 15(1390 - 80t)
19040 - 476t = 20850 - 1200t
724t = 1810
t = 2.5
Ratio of their profit = [5000 * 5 + 6000 * 3]: [4000 * t + 5000 * (8 - t)]: [7000 * (8 - t)]
= 43000: 37500: 38500 = 86: 75: 77
Share of R in the business = 11900 * ($\frac{77}{238}$) = Rs.3850