Detective- Detective Riddle

Ganpat is found dead in his office at his desk. Detective Mehul was working on this case and had narrowed the suspects down to three people

His Friend - "Mr Rakesh Gupta"
Ganpat's wife - "Bhawna"
His Secretary - "Jason Kumar" 

All three suspects visited Ganpat on the day of his murder for various reasons as they told Detective Mehul.As we know where the police failed, Detective Mehul comes. He was able to find a note on the corner of the wall. "7891011" was written on it. Detective Mehul wastes no time in announcing the killer. Who was the killer?

• Mr Rakesh Gupta
• Ganpat's wife
• Bhawna
• Jason Kumar

Jason Kumar