I need to show my work and I don't know how to do this please help i'll rate 5 stars, say thanks, find it helpful and do brainliest to anyone

Will mark the brainliest.paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?