Hi

I'm struggling with if else conditions in zoho crm fields formulas:

I want to implement this

If a = 10

      If (ac or ac2)  then 120

      else if (ab or ab2)  then 140

      else 160

I've done this 

(If(${a}<=10,

      If(Or(${ac },${ac2}),120),

      If(Or(${ab },${ab2}),140)

,160)

But i have missing parenthesis error