Maximize contribution$=$

$3x_1+5x_2+7x_3$

$1x_1+7x_2+4x_{3}100$

$2x_1+1x_2+7x_{3}110$

$8x_1+4x_2+1x_{3}100$

$x_1,x_2,x_{3}0$

$(C_1$ : hours on machine $1)$

$(C_2$ : hours on machine $2)$

: hours on machine $3)$

a$)$ Using a computer software for solving LP$,$ the optimal solution achieved is:

$x_1=($round your response to two decimal places$).$