i get the below error when i try saving CLASS 1 below...the second class that is the problem is also below. I obviously don't understand objects or apex well, so any help would be greatly apprciated...

Error: Compile Error: Method does not exist or incorrect signature: [Decimal].getSmallQtyPenalty(Decimal, SOBJECT:Mfg_Run_Charges_Rate__c) at line 27 column 42

CLASS 1:

public class MOChargeRate{

public static decimal getMOChargeR(boolean noWin, boolean MOWinDie, boolean punchWin, boolean dblWin, boolean furnBlank, boolean furnPrePrint, decimal wrkPerMQty, decimal wrkQty, List mfgRCR){

  decimal MOCharge = 0.0;
  decimal punchChgAmt = 0.0;
  decimal winPenalty = 1;
  decimal punchUpchg = 0;
  decimal furnPenalty = 1;
  decimal smallQtyPenalty = 1;

  for (Mfg_Run_Charges_Rate__c MO : mfgRCR){
     if (wrkQty < 50000){
         if (MO.Pricing_Code__c == 'MO'){
           if (MOWinDie){
              if (furnBlank){
                 if (MO.Window__c == 'Special Window' &2& (MO.Furnished__c == 'Blank' || MO.Furnished__c == 'Both')){
                    smallQtyPenalty =smallQtyPenalty.getSmallQtyPenalty(wrkQty, MO );
                    winPenalty = MO.Window_Penalty__c;
                    break;
             }
           }
        }
     }
   }
  }
  return MOCharge;
)

SECOND CLASS:

public class smallQtyPenalty{

public static decimal getSmallQtyPenalty(decimal qty, Mfg_Run_Charges_Rate__c m){

  decimal smQtyPnlty;
  if (qty >= m.Small_Qty_1_Min__c && qty <= m.Small_Qty_1_Max__c){
     smQtyPnlty = m.Small_Qty_1_Penalty__c;
  } else if (qty >= m.Small_Qty_2_Min__c && qty <= m.Small_Qty_2_Max__c){
     smQtyPnlty = m.Small_Qty_2_Penalty__c;
  } else if (qty >= m.Small_Qty_3_Min__c && qty <= m.Small_Qty_3_Max__c){
     smQtyPnlty = m.Small_Qty_3_Penalty__c;
  } else if (qty >= m.Small_Qty_4_Min__c && qty <= m.Small_Qty_4_Max__c){
     smQtyPnlty = m.Small_Qty_4_Penalty__c;
  }
  return smQtyPnlty;
} }