Final answer:
The furniture store must sell a minimum of 16 tables to meet the requirements.
Step-by-step explanation:
To meet the requirements, the furniture store needs to sell no less than $12,000 worth of chairs and tables.
Since each chair is sold for $200, the total revenue from selling 13 chairs is $200 x 13 = $2600.
To meet the minimum requirement of $12,000, the store needs to sell $12,000 - $2600 = $9,400 worth of tables.
Since each table is sold for $600, the minimum number of tables the store must sell is $9,400 / $600 = 15.67, which should be rounded up to 16 tables.