smc

Answer Choice $A$: It is obviously incorrect because if $M$ is $50$ and we increase by $50$% and then decrease $49$%, $M$ will be around $37$. Answer Choice $B$: If $p$ is $100$ and $q$ is $50$, it should be equal but instead we get $100$ is more than $1$. This is therefore also incorrect. Answer Choice $C$: Obviously incorrect since if $q$ is larger than $1$, this is always valid since $\frac{1}{1-q}$ is less than $0$ which is obviously false. Answer Choice $D$: If $p$ is $100$ and $q$ is $50$, it should be equal but instead we get $100$ is less than $\frac{5000}{150}$. Therefore, $D$ is also incorrect. Answer Choice $E$: If $p$ is $100$ and $q$ is $50$, it should be equal, and if we check our equation, we get $\frac{5000}{50}$ = $100$. Therefore, our answer is $\boxed{p>\frac{100q}{100-q}}$