ABC Bookstore sells new books, n, for $12;, used books, u, for $8; and
magazines, m, for $5 each. The store earned $250 in revenue last month. The
store sold 5 more used books than new books, and twice as many magazines
as new books. Using the substitution method, how many magazines, new
books, and old books did ABC bookstore sell?
O A. n = 12; u = 14; m = 7
O B. n=12; u=8; m = 5
OC. n=14; u= 12; m = 7
OD. n = 7; u= 12; m = 14