成了
chéng le
to be done
to be ready; that's enough!; that will do!
succeed (成) + done marker (了) = it's done, that'll do
成 carries the sense of something reaching completion, and 了 signals that a new state has arrived. Together they land with the finality of snapping your fingers and saying 'sorted.'
饭做好了，成了，大家来吃吧。
fàn zuò hǎo le, chéng le, dà jiā lái chī ba.
The food is ready, that will do, everyone come and eat.
你别再解释了，成了，我已经明白了。
nǐ bié zài jiě shì le, chéng le, wǒ yǐ jīng míng bái le.
Stop explaining, that's enough, I already understand.