Beverages sold

$300$

$100$

$150$

$75$

Price per beverage

$$2\mathrm{.}00$

$$3\mathrm{.}00$

$$4\mathrm{.}00$

$$5\mathrm{.}50$

Material per beverage$($$$)$

$$0\mathrm{.}50$

$$0\mathrm{.}75$

$$1\mathrm{.}25$

$$2\mathrm{.}00$

Part $2$

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 $27\mathrm{.}5727\mathrm{.}57\%.($Enter your response as a percent rounded to two decimal places and include a minus sign if productivity$$ decreases.$)$

Part $3$

The change in multifactor productivity if Eiskaffee is added to the menu is negative $3\mathrm{.}63\mathrm{.}6\%.($Enter your response as a percent rounded to two decimal places and include a minus sign if productivity$$ decreases.$)$

Part $4$

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 enter your response here 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.$)$