A, B, and C started a business by investing 30%, by a, 14.28% of the remaining by B, and the remaining by C. If the period of their investment was 2 years, 1 year, and 6 months, find the ratio of their profit at the end.

6:1:3

          A = 30%      (Let total 100)

         B ⇒ \(\frac{100-30 × 14.28}{100}\)

           = 70 × \(\frac{1}{7}\) = 10%

        C = 100 - 30 -10 = 60%

              A   :     B    :      C

Inv. →    30       10          60

Time  →  2          1           0.5

             --------------------------

Profit  →  60        10          30

               6: 1 : 3