Question: If i have this LP model: Max z = 3x+2y s.t. 2x+y

If i have this LP model:

Max z = 3x+2y

s.t. 2x+y <= 100

x+y <=80

x <= 40

x,y >= 0

How can I calculate the range for each constrain ( the allowable increase and decrease for RHS) without solving the problem graphically ?

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