Ram invested Rs 30000 in a business. After few months, Shyam joined him with Rs 12000. The total profit was divided between them in the ratio 3 : 1 at the end of the year. After how many months did Shyam join?
1
\(7\frac{1}{3}\) months
2
8 months
3
7 months
4
\(8\frac{2}{3}\)months
5
None