A and B invested Rs 6000 and Rs 12000 respectively in a business. After 6 months, C joined them and B left after 9 months from the starting. If profit share of C at the end of one year is Rs. 18900 out of total profit which is Rs. 50400, then find amount invested by C?

let amount invested by C be Rs X
Profit share ratio = A : B : C
= 6000×12:12000×9:X×6
= 12000 : 18000 : X

ATQ, X/(30000+X) ×50400=18900
x = Rs 18000

By: Munesh Kumari