A two meter long core sample contained the following sections:

five competent lengths of $112,135,203,160$ and $170$ mm respectively,

two intact and continuous pieces of $350$ mm and $400$ mm long respectively,

a $115$ mm long piece, which is broken into two $60$ and $55$ mm long pieces due to rough handling, and

the remainder of core length comprising a mixture of core fragments less than $60$ mm in length.

Determine the RQD value of the core sample.