Answer:
The numbers are missing, so I looked for a similar question (see image):
first we must calculate the contribution margin:
plain popcorn = selling price - variable costs = $2 - $0.80 = $1.20
flavored popcorn = selling price - variable costs = $4 - $2.50 = $1.50
sales mix = 1 plain : 4 flavored
weighted contribution margin = [$1.20 + (4 x $1.50)] / 5 = $1.44
total fixed costs = $3,240
break even point in units = $3,240 / $1.44 = 2,250 units
the company must sell 2,250 x 1/5 = 450 plain popcorn boxes and 1,850 flavored popcorn boxes in order to break even