Karen runs a print shop that makes posters for large companies. it is a very competitive business. the market price is currently $1 per poster. she has fixed costs of $100. her variable costs are $1,500 for the first thousand posters, $1,200 for the second thousand, and then $800 for each additional thousand posters. what is her afc per poster (not per thousand! ) if she prints: a)1,000 posters b)2,000 posters c)10,000 posters