Pleaseee help im really confused You have been saving your allowance to buy a Nintendo Switch. You finally have saved up $400, but then you remember that tax in San Diego is 7.75%. If you plan to purchase a Nintendo Switch for $400, how much more money will you need in order to pay the sales tax?

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?