Please help with this

Shark Inc. has determined that demand for its newest netbook model is given by lnq−5lnp+0.004p=7, where q is the number of netbooks Shark can sell at a price of p dollars per unit. Shark has determined that this model is valid for prices p≥100.

Find E(p) = ?
Your answer should be in terms of p

What price will maximize revenue?

P=?

Question

Please help with this 

Shark Inc. has determined that demand for its newest netbook model is given by lnq−5lnp+0.004p=7, where q is the number of netbooks Shark can sell at a price of p dollars per unit. Shark has determined that this model is valid for prices p≥100. 

Find E(p) = ?
Your answer should be in terms of p

What price will maximize revenue? 

P=?

flawless · Answer

I got the first part E(p) = p(5/p - 0.004)