How to add a Rule to output TRUE/FALSE into a column ?

I have an excel.

I am trying to put a rule on column B.

rule is if any cell value of column B is greather than 250 , then I want to put TRUE in column D ...else put FALSE

Could you please tell me how to do this ?

Here is sample data...

Desktop 2000 ijkl
Mouse 100 pqrs
Laptop 5000 mnop
Printer 1500 qrst


After rule execution I want to have this ..

Desktop 2000 ijkl TRUE
Mouse 100 pqrs FALSE
Laptop 5000 mnop TRUE
Printer 1500 qrst TRUE



I am using Excel 2010