Need your help regarding Overtime calculation:?

2015-05-06T11:41:33Z

If my job hours are from 9 am to 6 pm. During this 01 Hr. Lunch time. The Salary salary package is following:

Basic: 5000
House Rent: 1000
Conveyance: 500
Other Allow: 500

The Overtime Rate is 1.25%

How will we calculate over time. Please give calculation also so i can understand your valuable answer.

Thanks.

?2015-05-06T16:20:55Z

overtime only affects the basic rate