Defined output based on Input given

Hi

i have table with 4 coloum

first 3 contain input and last one contain output

my query.

in the table if all 3 input Coloum have any value it give output in 4 coloum 150

in the table if all 2 input Coloum have any value and one is blank, it give output in 4 coloum 100

in the table if all 1 input Coloum have any value and 2 are blank, it give output in 4 coloum 50

in the table if all 3 input Coloum are blank, it give output in 4 coloum 0



Coloum 1 coloum 2 coloum 3 output

10 20 30 150
10 20 100
10 50
0