請問這篇英文有冇錯grammer

It looks like a comparasion report/essay, we usually avoid to use 3rd-person pronouns, like I, we, you...

By comparing the cost that the resturant will incur with the benefits that the majority of staff will gain, (**i don't know what you're trying to say)
solutions 1.2, 2.1, and 3.1 are recommended.
It is because that these solutions' costs are the lowest. (** always add THE in front of +est)
The benefit will be discovered in the long-run situation.

我估你係想話:
將公司的付出同員工的得著一齊比較, 我們建議用section 1.2, 2.1, 同3.1內所列的方法, 因為它們所需的成本最低, 所以最快達到收益...
"In the long run" 係解作 "長遠來計", 好似有點唔貼, 所以我幫你改左...

We evaluated the incurred cost by the restaurant and the potential positive effects on the staff, we suggest the three solutions described in section 1.2, 2.1, and 3.1. Their costs are the lowest among all the others, hence the goal will be achieved the fastest.