Sando's foods sells a single product,sandwiches. 700 units were sold resulting in $7,000 of sales revenue, $2,800 of variable costs, and $1,200 of fixed costs.

Required: The number of units that must be sold to achieve $6,000 of operating income is:

a.1,200 units

b.None of these answers are correct.

c.1,166 units

d.1,000 units