Answer:
4,200.
Explanation:
The operating income is the difference between the sales and total expenses. Total expense is the sum of the variable and fixed cost. Alternatively, sales less variable cost gives contribution margin. contribution margin less the fixed cost gives the net income. Let the number of units that must be sold to earn the targeted income be x
($60x) - ($21x) - $78,000 = $81,900
39x = $81,900 + $81,900
39x = $163,800
x = 4,200
The number of pairs of shoes Chillmax must sell to earn operating income of $81,900 is 4,200.