In-service date = 15.01.09

Useful life         = 6.5 months

Expiry Date Calculation

Date for 6 months                                         = 14.06.2009

Date for 0.5 months,                                     = Add 15 days (30 * 0.5)

Therefore the Expiry Date                            = 29.06.2009.

Note that in the above calculation months are considered as having 30 days.