In the statements below study the question asked and decide which of the following statement is/are necessary to answer the question:

Find the present salary of Arvind:

I. The salary increase every year by 15%
II. The salary at the time of joining was £18,000
III. He has joined the company exactly 10 years ago.

Which statement(s) are necessary.

all I, II, and III necessary

The correct answer is Option (4) → all I, II, and III necessary