The price of each ticket is $40.
Mr. Benson bought 12 tickets, so the total cost of the tickets without any discount is 12 * $40 = $480.
He received a discount for every ticket bought that exceeds 10. So if he bought 12 tickets, he received a discount for 2 tickets.
Let's calculate the discount amount. The discount is x% of the ticket price, which is 0.01 * x * $40 = 0.4x.
Since he received a discount for 2 tickets, the total discount amount is 2 * 0.4x = 0.8x.
The total amount Mr. Benson paid is the cost of the tickets without any discount minus the discount amount: $480 - 0.8x.
We are given that the total amount Mr. Benson paid is $476, so we can write: $480 - 0.8x = $476.
Simplifying the left side, we get: -0.8x = -$4.
Dividing both sides by -0.8, we get: x = 5.
The value of x is 5.
#### 5
The answer is: 5
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
A concert ticket costs $40. Mr. Benson bought 12 tickets and received a x% discount for every ticket bought that exceeds 10. How much did Mr. Benson pay in all?
If we know the answer to the above question is 476, what is the value of unknown variable x?

### Answer:
