Returns a new copy of the BreakdownSet multiplied by another BreakdownSet. There must be a corresponding Breakdown for each Breakdown in both sets for this function to succeed. The metadata Breakdowns within the set are multiplied and the results combined into a new BreakdownSet. 

This feature is similar to the BreakdownSet divide function and can be used to create  meaningful Breakdown data of two metrics when the output value of the KPI formula is the value of one metric multiplied by another, then the output metadata would be on BreakdownSet multiplied by the other. 

var adwordPrice = metrics.getLatest('Adword Price');
var adwords = metrics.getLatest('Adwords');
var cost = adwordPrice.value() * adwords.value();
var breakdown = adwords.breakdown().multiply(adwordPrice.breakdown());

return {
    value : cost,
    breakdown : breakdown
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