please show work NOT on excel for a and b. Thanks

The Morning Brew Coffee Shop sells Regular, Cappuccino, and Vienna blends of coffee. The shop's current daily labor cost is $320, the equipment cost is $125, and the overhead cost is $225. Daily demands, along with price and material costs per beverage, are given below: $0.50 Regular Vienna Coffee Cappuccino coffee Beverages sold 400 100 150 Price per beverage S2.00 $3.00 S4.00 Material per beverage ($) $0.75 $1.25 Harald Luckerbauer, the manager at Morning Brew Coffee Shop, would like to understand how adding Eiskaffee (a German coffee beverage of chilled coffee, milk, sweetener, and vanilla ice cream) will alter the shop's productivity. Her market research shows that Eiskaffee will bring in new customers and not cannibalize current derrand. Assuring that the new equipment is purchased before Eiskaffee is added to the menu, Harald has developed new average daily demand and cost projections. The new equipment cost is $200, and the overhead cost is $350. Modified daily demands, as well as price and material costs per beverage for the new product line, are given below: BA Regular Vienna Coffee Cappuccino coffee Eiskaffeg Beverages sold 400 100 150 125 Price per beverage $2.00 $3.00 S4.00 $6.00 Material per beverage (S) $0.50 $0.75 S1.25 $1.00 a. Calculate the change in labor and multifactor productivity if Eiskaffee is added to the menu. (Note: Be sure to round each individual labor and multifactor productivity to no fewer than two decimal places before calculating the percentage changes.) The change in labor productivity if Eiskaffee is added to the menu is%. (Enter your response as a percent rounded to two decimal places and include a minus sign if productivity decreases.) The change in multifactor productivity if Eiskaffee is added to the menu is %. (Enter your response as a percent rounded to two decimal places and include a minus sign if productivity decreases.) b. If everything else remains unchanged, how many units of Eiskaffee would have to be sold to ensure that the multifactor productivity increases from its current level? At least units of Eiskaffee would have to be sold to guarantee the increase in multifactor productivity. (Enter your response rounded up to the next whole number.)