A YouTube ad for a loan company states "You only pay $27$ cents a day for each $$500$ borrowed." Using $360$ as the number of days in a year $($a banker's year$),$ if

you borrow $$6500$ for $125$ days:

$($a$)$ What amount will you repay $($total$,$ including principal$)$ based on the implied interest rate, assuming the loan is calculated using simple interest?

dollars

$($b$)$ What annual rate of interest charged? $r=$

so the annual interest rate $($as a percent$)$ is percent