A department store buys 300 shirts at a cost of ​$9,600 and sells them at a selling price of ​$40 each. Find the percent markup. The percent markup is………………...%. ​(Round to the nearest whole number as​ needed.)

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

Afurniture manufacturer produces chairs and sofas. each chair requires 10 yards of fabric, and each sofa requires 20 yards of fabric. the manufacturer has 300 yards of fabric available. to fulfill orders, the number of sofas must be at least twice the number of chairs. let x be the number of chairs and y the number of sofas. which inequalities are described in the problem? check all of the boxes that apply