Find the missing number that should come at the place of question mark (?). 
The rule is applied column-wise. If the top number is \(n\):
Middle \(= n(n-1)\), and Bottom \(= n(n+1)\).
Check Column 1 (top \(17\)): \(17\times16=272\) (middle) and \(17\times18=306\) (bottom).
Check Column 3 (top \(19\)): \(19\times18=342\) and \(19\times20=380\).
So for Column 2 (top \(13\)): bottom \(=13\times14=182\).
\(\boxed{182}\)

| 1 Year Commission Earned by Five Salesmen | ||||||
|---|---|---|---|---|---|---|
| Figures in Rupees | ||||||
| Year → | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 |
| Salesman ↓ | ||||||
| A | 27350 | 28500 | 25200 | 29800 | 24600 | 27000 |
| B | 26850 | 27900 | 27400 | 28000 | 28500 | 29000 |
| C | 26200 | 27900 | 28200 | 29100 | 29400 | 30000 |
| D | 27850 | 30040 | 29800 | 30060 | 29800 | 32000 |
| E | 28640 | 29000 | 28750 | 30000 | 29750 | 29700 |



| Withdrawals | Balance left |
| Rs. 50 | Rs. 50 |
| Rs. 25 | Rs. 25 |
| Rs. 10 | Rs. 15 |
| Rs. 8 | Rs. 7 |
| Rs. 5 | Rs. 2 |
| Rs. 2 | Rs. 0 |
| Rs. 100 | Rs. 99 |