How to display in email Service recurring price x 12? Email Template Smarty

[f4u]

Hello,

The documentation mentions the possibility of using full spectrum of Smarty syntax, by taks is to display in the Email for a given Product/Service the Recurring price (monthly) multiplied by e.g. 10 or 12 for upgrade offer. I've tried following:

{math equation="price * intercept" 
price={$service_recurring_amount}  - but the issue with double brackets in sytax may occur
intercept=12 
format="%.2f"} 

{math equation="price * intercept" 
price=$service_recurring_amount
intercept=12 
format="%.2f"}

but the amount is not show, but there is also no syntax error for smarty when sending, any ideas how to display Service recurring price x 12?