In a recent year, the price of a gallon of heating oil in a new england town rose 5 cents, dropped 2 cents, and then rose 4 cents. by how much did the price change during that period?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax