Tenzin saves ₹1 on the first day of a month, ₹2 on the second day, ₹3 on the third, and so on. How much has he saved in total at the end of the 25th day?

Explanation

1. 01

   He saves the sum of the first 25 natural numbers.

2. 02

   Sum = $\frac{n(n+1)}{2} = \frac{25 \times 26}{2} = 325$.

3. 03

   Total saved = ₹325.