How to join two list and result one List ?

I have List<Products> Data,

Product Name	Product Price	DateTime
Prod1	66	22/10/2013
Prod2	55	21/03/2014
.	.	.
.	.	.
.	.	.

Now I divided this list into two more resultant list by grouping,

Var list1=Products.GroupBy(p => p.DateTime.Value.Hour);

Hours	Counts
1	23
2	66
.	.
.	.
.	.

Var list2=Product. .Where(p=>p.product_price <= 50).GroupBy(p => p.DateTime.Value.Hour);

Hours	Counts
1	20
2	55
.	.
.	.
.	.

Now I want to divide list2 counts by list1 counts one by one and store it in third list as result,

Hours	Counts
1	20 / 23
2	55 / 66
.	.
.	.
.	.

how can I do this or is there any other simple way of doing it in Linq To Entity.

Solved,

        var result = from list1 in

                    (from p in Products group p by (p.DateTime.Value.Hour) into Grp                         select new { Hours=Grp.Key, Count=Convert.ToDouble( Grp.Count())})

                    join list2 in

                    (from p in Products where p.ProductPrice<=50 group p by (p.DateTime.Value.Hour) into Grp select new {Hours=Grp.Key,Count=Convert.ToDouble( Grp.Count()) })

                                       

                    on list1.Hours equals list2.Hours

                  

                    select new

                    {

                        Hours = list1.Hours,

                        Counts =Convert.ToDouble( list2.Count / list1.Count)

                    };