Final answer:
The balance in the supplies account is $2000.
Step-by-step explanation:
The balance in the supplies account can be calculated by adding the initial payment for supplies ($1200) and the purchases on account ($1000), then subtracting the payment made on the accounts payable ($200). This would give us a total of $1200 + $1000 - $200 = $2000. Therefore, the balance in the supplies account is $2000.