Tunes Corporation manufactures and sells portable radios. The radio sells for $40 per unit and its variable costs per unit are $20. Fixed costs are $57,000 per month for sales volumes up to 31,000 radios. If more than 31,000 radios are sold, the fixed costs will be $60,000. The flexible budget would reflect what monthly operating income for a sales volume of 36,000 radios? A. $60,000 OB. $720,000 OC. $1,440,000 OD. $660,000