Electricity a/c ipcc

guys,  i'll be giving A/Cs grp2 exam (ipcc) on 11th may.
i am facing problem with an Electricity sum given in the practice Manual of ICAI (question 1) on depreciation
we know, the depreciation of self propelled vehicles in 9.50%
but in the solution dey has taken it as 5.28%
which rate should i take.
NOTE: in the sum it is mentioned as VEHICLES
shud i assume that the vehicles mentioned is not self propelled vehicle.