IMC 2012 — Keystage 3 (IWYMIC) — individual Question 15

In triangle $ABC$, $\angle A=90^\circ$, $\angle B=20^\circ$. Points $E,F$ lie on $AC,AB$, respectively, with $\angle ABE=10^\circ$, $\angle ACF=30^\circ$. Find $\angle CFE$.