For the coming year, River Company estimates fixed costs at $$109,000,$ the unit variable cost at $$21,$ and the unit selling price at $$85.$ Determine the following: If required, round to the nearest whole unit and round interim calculations to one decimal place.

a$.$ What is The break$-$even point in units of sales?

units

b$.$ What is The unit sales required to realize operating income of $$150,000.$

units

c$.$What is The probable operating income if sales total $$500,000.$

$

in the question it says "round to the nearest whole unit and round interim calculations to one decimal place". Which ones are considred interim calculations? For example should a$)$ be $1703$ or $1703\mathrm{.}1?$