well,I really think naming a varible is difficult,especially in a large project.It always takes me a lot of time to find out a meaningful name,and I often worried about whether I name two varibles the same name.

I think it is a waste of code

I think the InvItem.Price is an integer,if so,the division will diacard the part after decimal point automatically.

That sounds good,I think bicycle is a good choice than car.But be careful,you should make sure the security of the route at first.