Suppose you budgeted $1400 for field expenses for the year. How many miles could you drive if gas were $1.75 per gallon and your vehicle average 25 miles per gallon
25 times 1.75 equals 43.75. keep multiplying 43.75 by 2 until you reach 1400. And multiply 25 by 2 every time you multiply 43.75 by 2, because whatever you do to one side you do to the other.
