Answer:
The answer to your question is: <em>392</em><em> </em><em>×</em><em> </em><em>k</em><em> </em><em>=</em><em>16</em>
Answer:
B
Step-by-step explanation:

We know that
and 
Substitute in the value. 
Use a calculator to multiply. 
Answer:
Numbers of students at a primary school before= 240
Number of increased students =42
Again,
Increased number of students in percent(%)= 42/240×100%= 17.5%
Therefore 17.5% students are increased this year.
The answer is y=2. Hope this helps!