Using Conditional Logic on Calculation Field?

I have a Calculation field on the form, with the following calculation:

{number-1}*10.00

So, when the site visitor selects a number from the Number of Tickets dropdown box, the Total amount to be paid will be that number * $10.00. That works great.

However, I need to charge only $7.00 per ticket if they select 8 or more tickets from the Number of Tickets dropdown box. Something like this:

If {number-1} < 8 then total = {number-1}*10.00
else
total = {number-1}*7.00

Thanks in advance. Love this Forminator WordPress plugin!

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