Caiman Distribution Partners is the Brazilian distribution company of a U.S. consumer products firm. Inflation in Brazil has made bidding and budgeting difficult for marketing managers trying to penetrate some of the country's rural regions. The company expects to distribute 450,000 cases of products in Brazil next month. The controller has classified operating costs (excluding costs of the distributed product) as follows.

Account	Operating Cost			Behavior
Supplies	$	637,000		All variable
Supervision		219,000		$	152,000	Fixed
Truck expense		1,350,000		$	189,000	Fixed
Building leases		845,000		$	557,000	Fixed
Utilities		228,000		$	137,000	Fixed
Warehouse labor		858,000		$	128,000	Fixed
Equipment leases		744,000		$	584,000	Fixed
Data processing equipment		951,000		All fixed
Other		861,000		$	395,000	Fixed
Total	$	6,693,000

Although overhead costs were related to revenues throughout the company, the experience in Brazil suggested to the managers that they should incorporate information from a published index of Brazilian prices in the distribution sector to forecast overhead in a manner more likely to capture the economics of the business.

Following instructions from the corporate offices, the controller's office in Brazil collected the following information for monthly operations from last year.

Month	Cases	Price Index	Operating Costs
1	290,000	115	$5,699,149
2	339,000	110	5,806,648
3	291,000	111	5,849,915
4	387,000	124	5,927,627
5	388,000	121	5,939,145
6	366,000	118	6,043,374
7	385,000	119	5,918,505
8	442,000	132	6,133,878
9	385,000	137	6,126,140
10	400,000	133	6,186,635
11	411,000	133	6,208,809
12	443,000	146	6,362,265

These data are considered representative for both past and future operations in Brazil.

b. Use the high-low method to compute an estimate of operating costs assuming that 450,000 cases will be shipped next month. (Round variable cost to 5 decimal places. Round intermediate calculations and final answer to nearest whole dollar amount.)

Note: I have tried an answer of 6,392,603 and 6,392,604 and they were both marked as incorrect. I think something is wrong in my rounding, but I can't figure it out. Please help!