The average cost of gas in 2015 was $3.40. The average cost of gas in 2018 was $2.35. What is the percent decrease in the cost?

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?

Awoman won a 4000-m race with a time of 12.089 min. what was her rate?

The weather forecaster says that there is a 51% chance of rain today. which statement describes the likelihood that it will rain today?