The correct answer is $\boxed{\text{C}}$.
To calculate the total figure, we need to add the direct service labour, idle time wages, and overtime premium.
Direct service labour: $7000
Idle time wages: $2000
Overtime premium: $950
Total: $9950
Option A is incorrect because it is the sum of the direct service labour and idle time wages.
Option B is incorrect because it is the sum of the direct service labour, idle time wages, and overtime premium, minus $50.
Option C is correct because it is the sum of the direct service labour, idle time wages, and overtime premium.
Option D is incorrect because it is the sum of the direct service labour, idle time wages, and overtime premium, plus $50.