Litecoin price not only depends on the halvening but also depends on the state of the bitcoin market, if the bitcoin can exceed the price of 11k and the possibility of up to 20k will be easier and litecoin may exceed $ 250 ..
It is but it has pumped on its own for the past 2 quarters. By January 1, 2019 price was $30 and it was the probable bottom for it. And today, it has rose by almost 400% since the beginning of this year.
Litecoin's halving has its impact already and the price of bitcoin to $11k will also bring significant positive impact for it. But your assumption is too low for bitcoin to reach $20k, Litecoin's price will just only be $250? I don't think that it will that kind of low.