This is all the data you have: The CPI today (at any point in time--whenever "today" may be) stands at 228.5, this should be interpreted to mean that:
a. prices have risen 228.5% since the base period
b. the economy currently is experiencing inflation
c. that representative bundle of goods and services that would have cost $10 in the base period would now cost $22.85
d. all the above are correct interpretations