Answer: hello your question lacks the required diagram attached below is the diagram 
answer : 29528.1 N/m^2
Step-by-step explanation:
Given data :
dimensions of tank :
Length = 5-m 
Width = 4-m 
Depth = 2.5-m
acceleration of tank = 2m/s^2
Determine the maximum gage pressure in the tank
Pa ( pressure at point A ) = s*g*h1 
 = 10^3 * 9.81 * 3.01 
 = 29528.1 N/m^2
attached below is the remaining part of the solution