How much to charge a bank in the US?

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Hi

I've taught EFL for many years. I may have a 'gig' teaching in the US now, teaching business writing to bank employees. I don't know what level the employees are in the bank. There may be a component of ESL since it is a very international area.

Does anyone have an idea of how much to charge as a corporate trainer doing outsourced training like this?

Thanks
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