The storage charge is based on the number of units in the customer’s inventory on the first day of each calendar quarter and is invoiced at the beginning of each quarter. 

It is to be paid in advance at the following rates:

UNITS
@ / QUARTER
1 - 100
$15.00 Minimum
101 - 500
0.14 per unit
501 - 2000
0.11 per unit
2001 - 3500
0.08 per unit
3501 - 5000
0.07 per unit
5001 - 7500
0.06 per unit
7501 +
0.04 per unit

(Example:  If 600 units are in inventory on the first day of the quarter, all 600 units will be invoiced at 10 cents per unit for a total of $60.00)