A parcel delivery company delivered $103,000$ packages last year, when its average employment was $84$ drivers. This year, the firm handled $112,000$ deliveries with $96$ drivers. What was the percentage change in productivity over the past year?

A fast$-$food restaurant serves hamburgers, cheeseburgers, and chicken sandwiches. The restaurant counts a cheeseburger as equivalent to $1\mathrm{.}25$ hamburgers and chicken sandwiches as $0\mathrm{.}8$ hamburger. Current employment is five full$-$time employees who each work a $40-$hour week. If the restaurant sold $700$ hamburgers, $900$ cheeseburgers, and $500$ chicken sandwiches in one week, what is its productivity? What would its productivity have been if it had sold the same number of sandwiches $(2,100),$ but the mix was $700$ of each type?