castka	sleva	bonus	celkem
$150	3%	$4.50	$154.50
$200	4%	$8	$208
$250	5%	$12.50	$262.50
$300	6%	$18	$318
$350	7%	$24.50	$374.50
$400	8%	$32	$432
$450	9%	$40.50	$490.50
$500	10%	$50	$550