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Ineed in figuring out this problem.

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

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air