The cover for a 10 22-in. access hole in an oil storage tank is attached to

Question:

The cover for a 10 × 22-in. access hole in an oil storage tank is attached to the outside of the tank with four bolts as shown. Knowing that the specific weight of the oil is 57.4 lb/ft³ and that the center of the cover is located 10 ft below the surface of the oil determine the additional force on each bolt because of the pressure of the oil.

1 in. 10 in. -22 in. I in.