A post tensioned concrete beam of rectangular section 200mm wide and 300mm deep is stressed by a parabolic cable with eccentricity 50mm at centre of span, area is 3×104mm2, initial stress is 1200n/mm2 Find the stress in concrete at the level of steel?

• A. 10n/mm2
• B. 15n/mm2
• C. 6n/mm2
• D. 8n/mm2