A company gives each worker a cash bonus every Friday, randomly giving a worker an amount with these probabilities: $10 - 0.75, $50 - 0.25. Over many weeks, what is a worker's expected weekly bonus?

1. 10 x 0.25 + 50 x 0.75 = $40
2. (10 + 50) x (0.75 x 0.25) = $11.5
3. 10 x 0.75 + 50 x 0.25 = $20
4. Cannot say as the number of weeks is not provided.