The security deposit money to buy coffee

Today, Wednesday, January 18, 2012. I'm  Fransiskus  Jelata  go out from school area to lunch. The security deposit money to buy coffee. Please buy coffee on packages  not  had made on glass (plastic)," he says. He  give money Rp 4.000. I buy it. I add 1 package to them so total 4 packages. I  increase Rp 1.000 .  My heart not  very agree when they  do it because the same people had  some  time to do it. It is  charge (membebankan) to me. I try to manage  my feeling. May be God  help me, give the full grace, include on  economic.