a piece of cake
US /ə piːs əv keɪk/
UK /ə piːs əv keɪk/

1.
sangat mudah, gampang sekali
something that is very easy to do
:
•
The exam was a piece of cake; I finished it in half the time.
Ujian itu sangat mudah; saya menyelesaikannya dalam separuh waktu.
•
Learning to ride a bike was a piece of cake for him.
Belajar naik sepeda sangat mudah baginya.