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.
|
City → |
B |
C |
D |
K |
|
Activity ↓ |
||||
|
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?
1
15
2
10
3
30
4
20