Question:
The easiest way to make an estimate is to round each number so there is only one nonzero digit. Then you can easily add up the numbers:
$2069_w60_h13.png$
$8436_w60_h13.png$
$8593_w69_h13.png$
$5694_w59_h14.png$
$8436_w60_h13.png$
70+70+100+20+70=330