If you're talking about this question:
Q Use the given Annex to determine the Dry Operating Index for a DOM of 35,000kg and a %MAC of 14%.
(a) 35
(b) 40
(c) 45
(d) 50
You go to page 31 of the manual, enter the graph with DOM from the left, move across until you cross the 14%MAC line, read down to an index of 40.