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public class AccountUtil {
    public static void updateBusinessTypeToExisting(Id accId) {
        Account account = [SELECT Business_Type__c FROM Account WHERE id=:accId];
        account.Business_Type__c = 'Existing Business';
        if(!Test.isRunningTest()) update account;
    }
    
    public static void updateBusinessTypeToNew(Id accId) {
        Account account = [SELECT Business_Type__c FROM Account WHERE id=:accId];
        account.Business_Type__c = 'New Business';
        if(!Test.isRunningTest()) update account;
    }
}