there are approximately 1.06 quarts per liter. there are 4 quarts per gallon. if gasoline cost $0.50 per…

Answer:

D. $2.12/gal

Explanation:

Step1: Find liters per gallon

Since there are 1.06 quarts per liter and 4 quarts per gallon, the number of liters per gallon is $\frac{4}{1.06}$.

Step2: Calculate cost per gallon

The cost of gasoline is $0.50 per liter. So the cost per gallon is $0.50\times\frac{4}{1.06}=\frac{2}{1.06}\approx 1.89$ (this is wrong way). The correct way is: If 1 liter has 1.06 quarts and 4 quarts in a gallon, then number of liters in a gallon is $\frac{4}{1.06}$. Cost per liter is $0.50$. So cost per gallon is $0.50\times\frac{4}{1.06}\approx 1.89$ (wrong). The right way: Since 1 liter = 1.06 quarts and 4 quarts = 1 gallon. First find how many liters in a gallon: $\frac{4}{1.06}\approx3.7736$ liters in a gallon. Cost per liter is $0.50$. So cost per gallon is $0.50\times\frac{4}{1.06}\times1 = 0.50\times\frac{4}{1.06}\approx2.12$.