changed bank-yield calculation
	modified:   data
	modified:   selector.scm
	modified:   knowledgebase.scm
	modified:   selector.scm
	modified:   explainer.scm
	modified:   knowledgebase.scm
	modified:   explainer.scm
	modified:   knowledgebase.scm
	modified:   explainer.scm
	modified:   knowledgebase.scm