If you answer 30 problems on in a day and 12 people find your answer helpful on each problem, now many people did you help out?

Me with this one question, and i'll upvote the brainliest answer

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2