तीन साझेदार, A, B और C लाभ को 2:3:4 के अनुपात में साझा करते हैं। एक नया साझेदार D शामिल हुआ जिसने A और C प्रत्येक के हिस्से का आधा भाग लिया। यदि अब D का लाभ में हिस्सा 100 रुपये है, तो कुल लाभ ज्ञात कीजिए।

Three partners invested in a business in the ratio 8:5:4. They invested their capital for 3 months, 10 months, and 9 months respectively. What was the ratio of their profits?

A started a business with an investment of ₹21,000 and after a few months, B joined him with an investment of ₹15,000. At the end of the year, the total profit was divided between them in the ratio 12 : 5. After how many months did B join the business?