help me with june 12 p51 plz

[warren]

for Physics a level June 12 P51 No.2 (b).... how to find the absolute uncertainties in lg(y/mm)
help me plz..thanks

link: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s12_qp_51.pdf