Gasoline was $3.739 per gallon one week and $3.879 per gallon the next. By how much did the price change?
Understand the Problem
The question is asking for the difference in price of gasoline between two weeks, specifically how much the price changed when it went from $3.739 to $3.879 per gallon.
Answer
The price of gasoline changed by $0.14$.
Answer for screen readers
The price of gasoline changed by $0.14$.
Steps to Solve
- Identify the initial and final prices
Initial price of gasoline: $3.739 \text{ per gallon}$
Final price of gasoline: $3.879 \text{ per gallon}$
- Calculate the change in price
To find the change in price, we subtract the initial price from the final price:
$$ \text{Change in price} = \text{Final price} - \text{Initial price} $$
Substituting the values:
$$ \text{Change in price} = 3.879 - 3.739 $$
- Perform the subtraction
Now we simplify the calculation:
$$ 3.879 - 3.739 = 0.140 $$
Thus, the price of gasoline changed by $0.140 \text{ per gallon}$.
The price of gasoline changed by $0.14$.
More Information
The change in price of $0.14$ represents a 14-cent increase in the cost of gasoline per gallon from one week to the next.
Tips
- Confusing the initial and final prices: Ensure that the initial price is always subtracted from the final price.
- Forgetting to account for decimals: Be careful to align the decimal points correctly when performing subtraction.
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