A bar chart shows sales (in Rs. thousand) for 4 products over 3 years:
| Year | P1 | P2 | P3 | P4 |
|---|---|---|---|---|
| 2011 | 50 | 40 | 30 | 20 |
| 2012 | 60 | 50 | 40 | 30 |
| 2013 | 70 | 60 | 50 | 40 |
What is the total sales for P3 across all years?

In a sequence of numbers, each term is generated by multiplying the previous term by 2 and then subtracting 1. If the first term is 3, what is the fourth term in the sequence?
A pie chart shows the distribution of students across 5 faculties in a university. If 20% are in Arts, 25% in Science, 15% in Law, 30% in Engineering, and the rest in Commerce, what is the angle (in degrees) for Commerce?
For any natural number $k$, let $a_k = 3^k$. The smallest natural number $m$ for which \[ (a_1)^1 \times (a_2)^2 \times \dots \times (a_{20})^{20} \;<\; a_{21} \times a_{22} \times \dots \times a_{20+m} \] is: