1. Operating profit is 100.000 TL when sales revenue is 600.000 TL and 116.000 TL when sales revenue is 640.000 TL. Required: By using information above, calculate: 25 POINTS a) Total fixed costs. b) BEP in TL. c) Contribution margin ratio. d) Unit variable cost if selling price is 200 TL per unit. e) Operating profit when sales revenue is 610.000 TL. f) Sales revenue to earn 140.000 TL operating profit