doctor vs engineer

Engineer Doctor ke paas gaya aur
bola ghar jaane ki kya fees hai..??
Doctor:"300 rupees.
Engineer:"Chale Dr Sahab.. ??
Dr ne bike nikali
engineer aur Dr Ghar pahuch gaye
 Dr bola mareez kaha hai.. ??
 Engineer:"Mareez koi nahi hai pagal,
 taxi wala 500 maang raha tha aur tu
  300 mai le aaya...
  Engineer Rocked