Statement
The X airlines has decided to increase the passenger fare by 15% with immediate effect.
Assumptions
I. The demand for seats of X-airlines may remain unchanged even after the hike of the fare.
II. Other airline companies may also hike the passengers fares.

Any decision is taken assuming that it will be useful. Hence, none of the assumptions is implicit in the statement.

'Retirement from international cricket' means Shoaib does not play test cricket now as test cricket is a part of the international cricket. Hence, Assumption I is implicit. Assumption II is also implicit because it is clearly said that Shoaib targeted Tendulkar through his book and book is a write up.

Here, the manager stresses the need to appoint more subordinate officers. It does mean that present staff is not efficient. In fact, he wants to say that work is much more then the working capacity of present staff strength. Hence, Assumption II is invalid. But Assumption I is implicit because without assuming the availability or subordinate officers, the manager would not have said so.

Assumption I is implicit as if it had not been possible India would not have won after follow on. Further, the word 'surprising' tells that winning after follow on is very difficult and this is the reason it happens only 2nd time. But if it is possible, we cannot say that India will not repeat such victory again. Hence, Assumption II is invalid.

The fact that historians have done harm by distorting truth, means that people believe what is reported by the historians. So, I is implicit. II does not follow from the statement and so is not implicit.

Both the assumptions are implicit in the statement. the point which is highlighted in any advertisement is liked by people.

The given statement does not mean imprisonment is necessary. Nelson Mandela's dedicated service to the nation and his struggle for freedom, despite so many hardships won him the desired public appeal to be elected the President. Hence, neither I nor II is implicit.

The Given statement hints that in recent years, the number of people traveling by air has increased. This implies that large number of travelers can now afford air travel. Hence, only II is a valid assumption.

The statement advice that an executive should be task oriented as well as people oriented. It is based on the assumptions that some executives are only people-oriented and some executives are only task oriented. Hence, none of the assumptions follows.

It is assumed that the person instructed is capable of reading the book. However, we cannot say anything about the other sources of information. Hence, the Assumption I is implicit.