Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the mintage (bu) with the artist Royal Canadian Mint Staff and has an issue price (proof) of $54.95?

### Inputs:
table_name: table, columns: ['Year', 'Theme', 'Artist', 'Mintage (Proof)', 'Issue Price (Proof)', 'Mintage (BU)[ clarification needed ]', 'Issue Price (BU)[ clarification needed ]']

### Response:
SELECT Mintage (BU)[ clarification needed ] FROM table WHERE Artist = Royal Canadian Mint Staff AND Issue Price (Proof) = $54.95