Aaron used 20 centimeters of tape to wrap 4 presents. How much tape will Aaron need in all if he has to wrap 9 presents? Assume the relationship is directly proportional.

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