Im being timed will be grateful if me answer

The price of a coat increased from $78 to $92. what is the price increase percentage?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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