For the following questions answer them individually
A shopkeeper by selling 13 Titan watches, earns a profit equal to the selling price of 3 Titan watches. His profit percentage is
Refer the below data table and answer the following question.

What are the 2 consecutive even natural numbers, sum of whose squares is 52?
What is the value of $$\sqrt{[\frac{(1 - cosA)}{(1 + cosA)}}]$$?
A rice trader buys 12 quintals of rice for Rs 1,870. 15% rice is lost in transportation. At what rate should he sell to earn 20% profit?
| # | Name | Overall Score |
|---|---|---|
| 1 | ajay mani | 5 |
| 2 | parupalli swathi | 5 |
| 3 | Shubham Saini | 5 |
| 4 | Preeti Negi | 5 |
| 5 | Umakanta Sahu | 5 |
| 6 | kartikey | 5 |
| 7 | Diwakar Kushwaha | 5 |
| 8 | Jaideep Modak | 5 |
| 9 | Babalu Koli | 5 |
| 10 | lalit kumar | 5 |