Table:
cookbook	$12

map of Africa	$11

cat calendar	$11

math book	$19

I'd like to know the total number of rows and columns in the provided table. Format your final answer as a JSON, using the structure {"row_number": "m", "column_number": "n"}.

There are 4 rows and 2 columns in the table. So, the final answer is {"row_number": "4", "column_number": "2"}.