B MC Qu$.03-70$ Students are going through a three$-$step...

tudents are going through a three$-$step process to obtain their ID cards. Each student will spend $2$ minutes at the registration desk before going to one f three cashiers to pay a fee for the ID card. After that, he$/$she will visit one of four ID processing stations to have his$/$her picture taken and ID card rinted. Visits to the cashier and ID processing station take $10$ and $20$ minutes respectively. If the demand rate is $0\mathrm{.}5$ student per minute, how long does it ake to process $20$ students, assuming the system is full?

Multiple Choice

$160$ minutes

$127$ minutes

$100$ minutes

$95$ minutes