A right angled bell-crank is designed to raise a load of 5kN at short arm whose length is 100mm. Also longer arm is of length 500mm. If permissible bearing pressure on pin is 10N/mm and diameter of the 20mm, find the length of the pin.

• A. 35.5mm
• B. 25.5mm
• C. 20mm
• D. 30mm