Taking money for donating blood voluntarily

I went to donate blood in a hospital. A brother from the patient's side arranged good food for me. He sometimes insisted me to choose any food. So, I decided. And after blood donation, he managed the transportation. He dropped me at my home. When I was at the gate of my house, he gave me a good amount of money. I did not want to take this but he put it in my hand and insisted. He said to me, "*Have some fruits purchased.*" So, was it permissible?