Consider the following linear programming problem:

MinZ$=,15x_1+20x_2$

Subject to:

$2x_1+3x_{2}200(constraint1)$

$2x_1+x_{2}70(constraint2)$

$x_1,x_{2}0$

What is the lower limit of the right hand side of the first constraint $(q_1)?$

$200$

$70$

$140$

$130$

None of the above