Answer
The answer is incorrect.
It should be $101$, $R : 14$.
Work Step by Step
$35\times101 + 4 \stackrel{?}{=} 3549$
$3535 + 4 \stackrel{?}{=} 3549$
$3539 \neq 3549$
However :
$35\times101 + 14 \stackrel{?}{=} 3549$
$3535 + 14 \stackrel{?}{=} 3549$
$3549 \stackrel{\checkmark}{=} 3549$