If you could count $1 per second, how many years would it take to count a 1 billion

Which of these choices show a pair of equivalent expressions?

Long division the problem is 40 ➗ 348 = ?

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?