Study the following table and answer the given question.
The table shows the expenditure of a family over the given years.
| Year | Expenditure in ₹ | ||||
| Food | Clothing | Education | Rent | Others | |
| 2011 | 2000 | 1200 | 3300 | 2000 | 4000 |
| 2012 | 2500 | 1100 | 3200 | 2300 | 4100 |
What is the total expenditure (in ₹) on food by the family for the year 2011 and 2012?
Find the volume of a sphere whose diameter is 84 m. [Use π = \( \frac{22}{7} \)]
If a sum amounts to 2\( \frac{1}{4} \) times the sum after 2 years on a certain rate of compound interest, compounded annually, then the rate of interest per annum is: