This is simple interest ration and percent 7 grade

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

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?

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents