帮忙翻译一下，谢谢！
1、Annual total cost of factory power where the supplier sets a tariff based on fixed charge plus a constant unit cost for consumption which is subject to a maximum annual charge. P4
2、Total annual direct material cost where the supplier charges a constant amount per unit which then reduces to lower amount per unit after a certain level of purchases.
3、Total annual direct material cost where the supplier charges a constant amount per unit but when purchases exceed a certain level a lower amount per unit applies to all purchases in the year.