Imposed by goveement below equilibrium price
Answer: 3.91
Explanation: We can calculate operating leverage by using following formula:-

where,
contribution = sales - variable cost
= sales - ( variable cost of goods sold + supplies )
= $52,260 - ( $26,260 + $5460)
= $20,540
Now, putting the values into equation we get :-

= 3.91
The interest earned by the Sherwood Day Corporation is calculated by subtracting from the net income all the expenses including the interest expense and the tax expense. Mathematically,
interest earned = $200,000 - ($40,000 + $30,000)
= $130,000