My scaling formula doesn't work cannot figure out why

My scaling formula doesn't work cannot figure out why

if(${Accounts.Total Premium 22 Manual} <= 10000,
   ${Accounts.Total Premium 22 Manual} * 0.10,
   if(${Accounts.Total Premium 22 Manual} <= 25000,
      (10000 * 0.10) + ((${Accounts.Total Premium 22 Manual} - 10000) * 0.08),))