How do I change the property value priceInfo.amount?

How do I change the property value priceInfo.amount?
After changing the quantity field in the shopping cart and submit the form, I need to convert the field value priceInfo.amount and then set it again.
How do I?
Thank´s.

Why do you need to convert this value and set it again?

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Hi,
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How do I change the property value priceInfo.amount?

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