Onyx Company has prepared a static budget at the beginning of the month. At the end of the month, the following information has been retrieved from the records.

Static budget:

Sales volume: 1,000 units: Price: $70 per unit

Variable expense: $32 per unit: Fixed expenses: $37,500 per month

Operating income: $500

Actual results:

Sales volume: 990 units: Price: $74 per unit

Variable expense: $35 per unit: Fixed expenses: $33,000 per month

Operating income: $5,610

Calculate the flexible budget variance for Sales Revenue.