Final answer:
Without additional information or a given relationship between the exports and imports for 1999, it is impossible to determine the value of imports for that year based on the provided data.
Step-by-step explanation:
If the imports in 1998 were Rs. 250 crores and the total exports in the years 1998 and 1999 together were Rs. 500 crores, then to find the imports in 1999, one needs to have additional information which does not seem to be provided.
Typically, in questions like this, you might see a balance of trade or an equation showing the relationship between exports and imports for each year. However, as the question stands, with the given information, it is not possible to determine the imports for 1999 accurately.
The question might be missing some information, or it could be a trick question intended to highlight the importance of having complete data when making calculations.