Consider the data of a certain number of activities of type P, Q, and R in the percentage of the total activities of the cities B, C, D, and K in the table below.
| Activity / City | B | C | D | K |
| P | 45 | 30 | 25 | 35 |
| Q | 25 | 30 | 35 | 30 |
| R | 30 | 40 | 40 | 35 |
If the total activities of B and C are 500 and 400, respectively, then what is the difference in activity R of B and C?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 10.
Total activities of B as given in the table = 45 + 25 + 30 = 100
But total activities of B given 500
This means 100 represent 500
Total activities of C as given in the table = 30 + 30 + 40 = 100
But total activities of C given 400
This means 100 represnt 400
Therefore the difference in activity R of B and C = (30 × 5) - (40 × 4) = 10