trigger in sql update table

Question

hi sir i have 2 table 

 price ( id  int primary key,

price decimal,

product_name nvarchar(30)) 

 

 

second table is

 

cart (

 

id int primary key,

price_id int foreign key  price(id),

price decimal)  

 

now i want when i change  price values in price table automatic  change in cart table price column