trigger OpportunityTrigger on Opportunity (after insert) {

	for (Opportunity opp :trigger.new)
	{
		if (opp.RecordTypeId == '012g00000000PxA' && opp.Amount >= 100000)
		{
			opp.Big_Value_Opportunity__c = true;
			opp.OwnerId = assignOwner(opp.AccountId);
		}
	}

	public Id assignOwner(Id accountId)
	{
		return [SELECT OwnerId FROM Account WHERE Id = :accountId][0].Id;
	}

}