When Henry had charged 612 dollars to his credit card the cost of his next purchase caused him to exceed his credit limit to 2000 dollars?

To determine the cost of Henry's next purchase that caused him to exceed his credit limit of $2000, we subtract his current balance of $612 from the limit. This means he could spend up to $2000 - $612 = $1388 without exceeding his limit. Therefore, any purchase over $1388 would lead him to exceed his credit limit.