Blossom Company's fiscal year end is December 31. On January 31, 2021, the company's partial adjusted trial balance shows the following: BLOSSOM COMPANY Adjusted Trial Balance (Partial) January 31, 2021 Debit Credit Supplies Prepaid Insurance Equipment $820 1,240 9,000 Accumulated Depreciation-Equipment $4,575 Salaries Payable 740 Unearned Revenue 640 Service Revenue 1,830 Depreciation Expense 75 Insurance Expense 310 Salaries Expense 1,850 Supplies Expense 930 If $1,740 was received in January for services performed in January, what was the balance in Unearned Revenue at December 31, 2020? Unearned revenue to $