To calculate the discount the manufacturer is offering, you can follow these steps:
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Normal Price per Battery: $19.95
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Discounted Price per Battery: $15.75
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Calculate the discount amount per battery: \[ \text{Discount per battery} = \text{Normal Price} - \text{Discounted Price} = 19.95 - 15.75 = 4.20 \]
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Calculate the total discount for the order of 20,000 batteries: \[ \text{Total Discount} = \text{Discount per battery} \times \text{Number of batteries} = 4.20 \times 20000 = 84000 \]
So, the manufacturer is offering a discount of $4.20 per battery, and for the total order of 20,000 batteries, the total discount amounts to $84,000.