If Vince charged $390 on his credit card with 22% APR and he paid his balance in full within the grace period, how much was he required to pay

$0 in case the credit doesn't charge a monthly fee. Or just the monthly fee.

Explanation:

The grace period is a time period where the customer can pay any expenses and the bank will not charge any interest. In other words, if you pay the full balance before the grace period is over, the bank will not change you any interests.

answer; complain or request hazard correction from your employer;

there's 11 people for the 1st position. then, no matter who gets it, there's only 10 left for the second, and then 9 left for the third. 11 x 10 x 9 = 990.   the answer is there are 990 different ways the positions can be filled by these applicants