Presto Candle Supply makes candles. The sales mix (as a percent of total dollar sales) of its three product lines is: birthday candles 30%, standard tapered candles 50%, and large scented candles 20%. The contribution margin ratio of each candle type is as follows. Candle Type Contribution Margin Ratio Birthday 10% Standard tapered 20% Large scented 45% (a)What is the weighted-average contribution margin ratio? (Round answer to 3 decimal places, e.g. 2.250.)