From "Java Modeling in Color with UML" pg 41:
Where to put a method? Take a feature statement, <action> the <result> <by|for|of|to> a <moment-interval|role|description|part, place, thing>. Put the initiating method in the corresponding class.
Here we want to "calculate the anticipated total of an RFQ." So we put the initiating method in the RFQ class.