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

### Instruction:
what is [po 4 3− ]/[a] (%) where [h 2 po 4 − ]/[a] (%) is 94.5?

### Inputs:
table_name: table, columns: ['[A] (mol/L)', 'pH', '[H 3 PO 4 ]/[A] (%)', '[H 2 PO 4 − ]/[A] (%)', '[HPO 4 2− ]/[A] (%)', '[PO 4 3− ]/[A] (%)']

### Response:
SELECT [PO 4 3− ]/[A] (%) FROM table WHERE [H 2 PO 4 − ]/[A] (%) = 94.5