Liam is selling coffee mugs to raise money for a trip. he buys mugs for $3 each and sells them to customers for $7 each. if he sells 100 coffee mugs, how much money will he have earned toward his trip?

Ashley spent half of her lunch money on a turkey sandwich. then she spent two-thirds of the money she had left on a bottle of juice and the rest of the money on a cookie. if the cookie cost $.75, how much lunch money did ashley have to start with?