Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Week # | Theme | Song choice | Original artist | Order # | Result |
| --- | --- | --- | --- | --- | --- |
| Audition | N/A | " Big Girls Don't Cry " | Fergie | N/A | Advanced |
| Hollywood | First Solo | " The Trouble with Love Is " | Kelly Clarkson | N/A | Advanced |
| Hollywood | Group Performance | " Mercy " | Duffy | N/A | Advanced |
| Hollywood | Second Solo | " Tattoo " | Jordin Sparks | N/A | Advanced |
| Top 36/Semi-Final 2 | Billboard Hot 100 Hits to Date | " Love Song " | Sara Bareilles | 1 | Eliminated 1 |
| Wild Card | N/A | " Reflection " | Christina Aguilera | 5 | Selected |
Question:
How many weeks featured duffy as the original artist?
Answer:
1.0