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At Sekon Company, prepayments are debited to expense when paid, and unearned revenues are credited to revenue when cash is received. During January of the current year, the following transactions occurred. Jan. 2 Paid $1,920 for fire insurance protection for the year 10 Paid $1,700 for supplies. 15 Received $6,100 for services to be performed in the future. On January 31, it is determined that $2,100 of the services were performed and that there are $650 of supplies on hand