Meghan counted the candies she had in a jar. she discovered that half of the candies were red. if she had 50 red candies, in which equation does x represent the total number candies in the jar?

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