how to implement an else if code

Guys, I need some help, I’m trying to implement something like the code below but I didn’t realize how.
 
in the column 1 I have values as $1.000,00 and $ 2.758,00, let’s call them “A2” and go on, and in the second column the rules
if(x > 10.000,00 && < =20.000,00){ 
return =  0,08} (I will convert to percentage)
else if(x > 20.001,00 && < =30.000,00){ 
return =  0,10}
else if(x > 30.001,00 && < =50.000,00){ 
return =  0,12}
else if(x > 50.0010,00){ 
return =  0,14}
else{“0”}