A phone that originally sold for $800 loses 3/5 of its value each year after it is released. How much is the phone worth after one year?

Group of answer choices

$710

$640

$400

$320

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup