Economics

A year's tuition fee at a university cost $5000 in 1990 when the CPI was 0.49. The cost of a year's tuition at the same university was $30,000 in 2015, when the CPI was 1.68. The real cost of tuition between 1990 and 2015:

Group of answer choices

1.is unchanged.

2.increased.

3.decreased.

4.may have decreased or increased.

Please show work