Mrs . martin has $7,000 in her savings account . alonzo has 1/10 as much money in his account as mrs. martin . how much money does alonzo have in his account

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