\( N_S =2*N_H\)
Statement1-
Assume the avg price Of softcover books = x
the avg price Of hardcover books = y = x+10
Revenue of softcover books = \( x*N_S\) =\(x*2N_H\) \( = xN_H +xN_H\)
Revenue of hardcover books =\( (x+10)*N_H = xN_H +10*N_H\)
We have no idea whether x is greater than10
Insufficient
Statement 2- \(\frac{ xN_S+yN_H}{N_S +N_H} >14\)
\(\frac{ x*2N_H + y*N_H }{ 3N_H} >14\)
2x+y>42
We can't compare revenues
Insufficient
Combining bothstatements
\(2x+y>42\)
\( 2x+x+10>42\)
[m] x>\frac{32}{3}
...
Statement1-
Assume the avg price Of softcover books = x
the avg price Of hardcover books = y = x+10
Revenue of softcover books = \( x*N_S\) =\(x*2N_H\) \( = xN_H +xN_H\)
Revenue of hardcover books =\( (x+10)*N_H = xN_H +10*N_H\)
We have no idea whether x is greater than10
Insufficient
Statement 2- \(\frac{ xN_S+yN_H}{N_S +N_H} >14\)
\(\frac{ x*2N_H + y*N_H }{ 3N_H} >14\)
2x+y>42
We can't compare revenues
Insufficient
Combining bothstatements
\(2x+y>42\)
\( 2x+x+10>42\)
[m] x>\frac{32}{3}
...
