Question
In case of loss, $C.P.=\frac{100\times\text{S.P.}}{100+\text{Loss}\%}$
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| Months | Number of watches sold |
| July | 1000 |
| August | 1500 |
| September | 1500 |
| October | 2000 |
| November | 2500 |
| December | 1500 |