Table:
lowest quartile
second quartile
third quartile
highest quartile
total

percent

mobile devices only
24.1
14.7
13.8
8.0
13.5

personal computer
75.9
85.3
86.2
92.0
86.5

To complete your task, analyze the table image and identify the positions of the specified cells. Ensure that you represent a cell's location using the JSON format {'value': '<cell value>', 'location': (Row_ID, Column_ID)}, with both row and column IDs starting from 1. Should a cell be absent in the table, denote its location as 'DOES NOT EXIST'.
Target cells:
(1) 'mobile devices only';
(2) 'lowest quartile';
(3) 'percent';
(4) 'total';
(5) '86.5';
(6) '86.2';
(7) '13.5';

The target cell locations are as follows:
(1) {'value': 'mobile devices only', 'location': (3, 1)}
(2) {'value': 'lowest quartile', 'location': (1, 2)}
(3) {'value': 'percent', 'location': (2, 2)}
(4) {'value': 'total', 'location': (1, 6)}
(5) {'value': '86.5', 'location': (4, 6)}
(6) {'value': '86.2', 'location': (4, 4)}
(7) {'value': '13.5', 'location': (3, 6)}