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:
| Value | Color | Obverse | Reverse | First issued |
| --- | --- | --- | --- | --- |
| 2.000 ₲ | Magenta | Adela and Celsa Speratti | School parade | 2008.0 |
| 5.000 ₲ | Orange | Carlos Antonio López | Palace of the Lopez | 1962.0 |
| 10.000 ₲ | Brown | Dr. José José Gaspar Rodríguez de Francia | May 15, 1811 scene | 1962.0 |
| 20.000 ₲ | Light blue | Paraguayan woman | Central Bank of Paraguay | 2005.0 |
| 50.000 ₲ | Beige | Agustín Pío Barrios | Guitar of Agustín Pío Barrios | 1981.0 |
| 100.000 ₲ | Green | Saint Roque González de Santa Cruz | Itaipú Dam | 1998.0 |
Question:
How much was a Reverse of guitar of agustín pío barrios before 1998?
Answer:
50.000 ₲