Consider the following Linear Programming Problem (LPP):
\[
\text{maximize } z = 10x_1 + 20x_2
\]
subject to
\[
x_1 \leq 36, \quad x_2 \geq 42, \quad x_1 + x_2 \geq 48, \quad 5x_1 + x_2 \leq 150, \quad x_1, x_2 \geq 0.
\]
The maximum value of \(z\) in the above LPP is equal to ______. (Answer in integer)