Decimals to Hundredths · Superchallenge problem

Here are ten numbers: $0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50$. In how many ways can you choose three different numbers from the list that add up to exactly $1$? (The order you pick them in does not matter.)