The Engineer's Companion-October Magazine Edition
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
India‟s First Ever Engineer‟s <strong>Magazine</strong> for Placement Preparation<br />
% = 100 + = 1 + =<br />
It means 7 is the original number.<br />
And after adding 96 it becomes 11 that means,<br />
4 unit = 96<br />
1 unit = 16<br />
7 unit = 112<br />
Question 9: If the sides of a square are increased by 40%. Find the percentage change in its area?<br />
Solution:<br />
Formula, ( ) %<br />
( ) %<br />
( 80 + 16) %<br />
96 %<br />
Question 10: If the radius of a circle is increased by 25% then find the percentage change in its<br />
area?<br />
Solution:<br />
25% =<br />
It means we can say radius of circle is 4.<br />
And new radius is 5.<br />
So area of original circle = 16π<br />
So new area of original circle = 25π<br />
Percentage change in area = × 100% = × 100% = 56.25%<br />
16 | T h e E n g i n e e r ’ s C o m p a n i o n<br />
TO P
Change language