In 2020, the yearly tuition at a state university was $30,000. In 2025, the yearly tuition at the same state university will be $37,000. Given the price of tuition for reference, the inflation rate of the U.S. dollar can be said to have increased by a factor of __________ in 5 years. A.) 0.81 b.) 0.23 c.) 1.7 d.) 1.23