A hotel numbers its fare classes from higher to lower as $1,2,3,$ and $4.$ The room prices for

these classes are $p_1=$$$250,p_2=$$$200,p_3=$$$150,$ and $p_4=$$$100.$ The demands for these

fare classes are denoted by D$1,$ D$2,$ D$3,$ and D$4.$ These demands turn out to have uniform

distributions with the following ranges:

$D1in[0,10],D2in[0,10],D3in[0,10],D4in[0,10].$

a$)$ Use EMSR$-$a heuristic to find the protection level $y_3$ for classes $\{1,2,3\}?$

b$)$ Use EMSR$-$a heuristic to find the protection level $y_2$ for classes $\{1,2\}?$

c$)$ Use EMSR$-$a heuristic to find the protection level $y_1$ for class $\{1\}?$

d$)$ What is the protection level $y_4$ for classes $\{1,2,3,4\}?$