Be agreed "at" + amount of money

Hello,

The price is now agreed at 9.9 dollars a unit.

“at” here is okay with me because of the exact amount of money follows (I mean, 9.9 dollars). If you don’t think so, how should I change instead of “at”?

Thank you in advance,
sweetpumpkin

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I would say “The price is now set at $9.9 per unit.” or “We have now agreed to set the price at $9.9 per unit.”

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You should not mix numerals with words. You can spell out whole number dollars, such as:

Nine dollars
One hundred dollars

Do not spell out decimal dollars. Always use zero or two decimal places.

$9
$9.90

In some formal uses, such as banking, dollars and cents can be spelled out.

Nine dollars and ninety cents

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