You should look at your "cost basis" in those funds to determine your profit. Any shares held over 1 year enjoy a 15% tax rate for most people.
For example if you sold $75,000 worth with a cost basis of $40,000 you'd owe tax on the $35,000 gains. At long-term capital gains rates (for most people) that would cost $5,250 tax on the $35,000 gains.
Last I checked, income + long-term capital gains totaling less than ~$418k per year leaves you in the 15% long-term capital gains tax bracket.