Answer:
Marvin will give the taxi cab driver $2.5 for a tip
Explanations:
The cost of transport to Marvin's workplace = $25
%tip given to the cab driver = 10%
Tip given to the cab driver = (%tip / 100) x Cost of transport)
Tip = (10/100) x 25
Tip = 250 / 100
Tip = $2.5