Table:
Number of bags	Number of silver buttons

1	5

2	10

3	15

4	?

Please identify the row and column numbers of the table displayed in this image. Output the final answer as JSON in the format {"row_number": "m", "column_number": "n"}.

There are 5 rows and 2 columns in the table. So, the final answer is {"row_number": "5", "column_number": "2"}.