Capital gains. Cardi is a doctor who loves to attend the opera in her free time. She wears expensive designer dresses to the opera. This year, she sold two dresses that she had bought three years ago. She realized a gain of $$510$ on one of them and a loss of $$290$ on the other. What is the total amount of capital gain that qualifies for preferential capital$-$gains tax rates $($i$.$e$.,$ net capital gain or $"$NCG$")?$