The following figures relate to the profits of a commercial concern for 8 years.
| Year |
1986 |
1987 |
1988 |
1989 |
1990 |
1991 |
1992 |
1993 |
| Profit(Rs.) |
15,420 |
15,470 |
15,520 |
21,020 |
26,500 |
31,950 |
35,600 |
34,900 |
Find the trend of profits by the method of three year moving averages.
