Mary makes herbal teas to sell . Her most popular blend is a combination of 2 kinds of mint, 75% spearmint and 25% peppermint, by weight . She buys the mint from a wholesale company . The prices she pays for each are shown in the table.
spearmint - $2.25
peppermint- $2.75
if Mary wants to sell her mint blend for 1.6 times her cost, what should she charge per ounce?