Gitansh withdrew Rs. $5000$ pm at the end of every month for ten months. Interest on drawing is charged @ $10\%$ p.a. Gitansh's interest on drawings is :

When fixed amounts are withdrawn at the end of every month for $10$ months:Total Drawings = $5,000\times 10=$ Rs. $50,000$.Average Period = $\frac{\text{Time left after first drawing}+\text{Time left after last drawing}}{2}$ Since drawings are made for 10 months and stopped, the time left after first drawing (at end of 1st month) is 9 months. The time left after the last drawing (at end of 10th month) is 0 months.Average Period = $\frac{9+0}{2}=4.5$ months.Interest = Total Drawings $\times \frac{\text{Rate}}{100}\times \frac{\text{Average Period}}{12}$ Interest = $50,000\times \frac{10}{100}\times \frac{4.5}{12}=5,000\times \frac{4.5}{12}=1,875$.