I need help, how to auto compute each individual drivers rate depending on their delivery miles

Each driver has their own rate example : $0.40 and $0.50

In booking form what i want to achieve is whenever i added new delivery it will auto compute like this. example: $0.40x200 miles= auto compute result in the driver pay box

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It sounds from your post that currently you are looking for simple math multiplication. If so , please take a look at the below help article

For column type, please take a look at Numeric types in the article below.

It sounds you will need decimal multiplications. So , please take a look at the below article

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