Service tax on air travel agent commision

Hello,

I am an Air travel agent, I wanted to you know what is the percentage of Service tax on my commision I received on my bookings?

For example,

I sold an ticket of Rs. 1000 /-, I get an commsion of 5% which is Rs. 50/-.

Now I have to a pay a service tax of 14.5% on my commion of Rs 50 /-(Service tax & SBC) which is Rs. 7.25 /-

Am I doing the right calculation ?

Please advise.