This Question:... 7 of 14 (3 complete) This Test: 10 Question Help Karl and Leonard want to make perfume. In order to get the right balance of ingredients for their tastes they bought 3 ounces of rose oil at $4.19 per ounce, 5 ounces of ginger essence for $3.18 per ounce, and 3 ounces of black currant essence for $4.36 per ounce. Determine the cost per ounce of the perfume. The cost per ounce of the perfume is $ (Round to the nearest cent.)​