Use Duality to Solve the Problem $w=4 y_{1}+4 y_{2}$ Subject To $5 y_{1}+10 y_{2} \geq 100$

Multiple Choice

Use duality to solve the problem.
-Minimize $w=4 y_{1}+4 y_{2}$
Subject to: $5 y_{1}+10 y_{2} \geq 100$
$10 \mathrm{y}_{1}+20 \mathrm{y}_{2} \geq 150$
$\mathrm{y}_{1} \geq 0, \mathrm{y}_{2} \geq 0$

A) 20
B) 10
C) 60
D) 40