Three persons A, B and C started a partnership business by investing Rs.3 lakhs, Rs.5 lakhs and Rs.12 lakhs respectively. At the end of the year the profit of B was Rs.4 lakhs. The total profit (in lakhs of rupees) is
Show Hint
In partnership problems with same time period, profit ratio is directly equal to investment ratio.
Concept:
In partnership, profit is divided in the ratio of investments (if time is same).
Step 1: Find the investment ratio.
Investments:
\[
3:5:12
\]
Total ratio:
\[
3+5+12=20
\]
Step 2: Use B’s profit share.
B’s share corresponds to:
\[
5
\]
Given B’s profit:
\[
4 \text{ lakhs}
\]
So:
\[
5 \text{ parts }=4
\]
Therefore:
\[
1 \text{ part }=\frac45
\]
Step 3: Find total profit.
Total parts:
\[
20
\]
So total profit:
\[
20\times \frac45
\]
\[
=16
\]
Thus, the total profit is:
\[
\boxed{16 \text{ lakhs}}
\]