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// This formula multiplies the value of the price field of the linked entry in pairs by the value of the attribute count of the linked entry.
 
// This formula multiplies the value of the price field of the linked entry in pairs by the value of the attribute count of the linked entry.
 
// The set of numbers obtained after multiplication is summed.  
 
// The set of numbers obtained after multiplication is summed.  
$sum('items.price', 'items:count', '@mul');
+
* $sum('items.price', 'items:count', '@mul');

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