The monthly incomes of trainees at a local business are normally distributed with a mean of $1100 and standard deviation $150. What percentage earn more than 1103 a month?

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