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:
| Team | Driver | Class | Chassis | Engine | Rounds |
| --- | --- | --- | --- | --- | --- |
| van Amersfoort Racing | Rahel Frey | C | Dallara F307 | Volkswagen | 1–8 |
| van Amersfoort Racing | Niall Quinn | C | Dallara F307 | Volkswagen | 9 |
| van Amersfoort Racing | Laurens Vanthoor | C | Dallara F307 | Volkswagen | All |
| Ombra Racing | Matteo Chinosi | C | Dallara F307 | Mugen - Honda | 1–8 |
| Ombra Racing | Philipp Eng | C | Dallara F307 | Mugen - Honda | 9 |
| Ombra Racing | Federico Leo | C | Dallara F307 | Mugen - Honda | All |
| Ombra Racing | Massimo Rossi | T | Dallara F304 | Mugen - Honda | 1–4 |
| Neuhauser Racing | Gerhard Tweraser | C | Dallara F307 | Mercedes HWA | All |
| Neuhauser Racing | Marco Oberhauser | T | Dallara F304 | Opel | All |
| HS Technik Motorsport | Sebastian Saavedra | C | Dallara F307 | Mercedes HWA | All |
| HS Technik Motorsport | Philipp Eng | C | Dallara F307 | Mercedes HWA | 1 |
| HS Technik Motorsport | Johnny Cecotto, Jr. | C | Dallara F307 | Mercedes HWA | 2–9 |
| HS Technik Motorsport | Shirley van der Lof | T | Dallara F304 | OPC-Challenge | All |
| Swiss Racing Team | Karline Stala | C | Dallara F307 | Mercedes HWA | 7–9 |
| Swiss Racing Team | Max Nilsson | C | Dallara F307 | OPC-Challenge | All |
| Swiss Racing Team | Frédéric Vervisch | C | Dallara F307 | OPC-Challenge | 1–5 |
| Swiss Racing Team | Tomi Limmonen | C | Dallara F307 | OPC-Challenge | 9 |
| Team rhino’s Leipert | Federico Glorioso | C | Dallara F307 | OPC-Challenge | 1–6, 9 |
| Team rhino’s Leipert | Sergey Chukanov | C | Dallara F307 | OPC-Challenge | All |
| Team rhino’s Leipert | Luca Iannaccone | T | Dallara F304 | Renault | All |
| Team rhino’s Leipert | Giulio Glorioso | T | Dallara F304 | Opel | All |
| Racing Experience | Karline Stala | C | Dallara F307 | Mercedes HWA | 1–4 |
| Racing Experience | Louis Wagner | C | Mygale M-07 | Opel | 6 |
| Racing Experience | David Hauser | C | Dallara F307 | Mercedes HWA | All |
| Racing Experience | Gary Hauser | C | Dallara F307 | Mercedes HWA | All |
| Performance Racing | Rafael Suzuki | C | Dallara F307 | OPC-Challenge | All |
| Performance Racing | Adderly Fong | C | Dallara F307 | OPC-Challenge | 1, 5–9 |
| Performance Racing | Satrio Hermanto | C | Dallara F307 | OPC-Challenge | 4 |
| Jo Zeller Racing | Frédéric Vervisch | C | Dallara F307 | Mercedes HWA | 6–8 |
| Jo Zeller Racing | Kevin Mirocha | C | Dallara F307 | Mercedes HWA | 9 |
| Franz Wöss Racing | Hamad Al Fardan | C | Dallara F307 | Mercedes HWA | 1–6 |
| Franz Wöss Racing | Bernd Herndlhofer | T | Dallara F304 | Opel | All |
| Franz Wöss Racing | Francesco Lopez | T | Dallara F304 | Opel | 7–9 |
| GU-Racing Team | Jens Höing | C | Lola B06-30 | Opel | 1, 2 |
| GU-Racing Team | Jens Höing | C | Dallara F307 | Mercedes HWA | 3, 4, 7–9 |
| Josef Kaufmann Racing | Kevin Mirocha | C | Dallara F307 | OPC-Challenge | 1–8 |
| Josef Kaufmann Racing | Esteban Gutiérrez | C | Dallara F307 | OPC-Challenge | 9 |
| KFR Team F3 | Dennis Swart | T | Dallara F304 | OPC-Challenge | All |
| JMS Jenichen | Marcel Schlenker | T | Dallara F304 | Opel | 1–4 |
| Auto-Häckel-Motorsport | Klaus-Dieter Häckel | T | Dallara F304 | Opel | 1–4 |
| Griffith's | David Moretti | T | Dallara F304 | Opel | 1 |
Question:
How many rounds did satrio hermanto go with an opc-challenge engine?
Answer:
4.0