ITMC 2018 Grade 7 National Preliminary set01 Question 11

Question 11

From one rectangle form rectangle 1 by increasing its length by 25% and decreasing its width by 20%; its area is $a$. Form rectangle 2 by decreasing the original length by 20% and increasing the original width by 25%; its area is $b$. Which statement is true?

$\frac14<\frac ab<\frac13$
$\frac13<\frac ab<\frac12$
$\frac12<\frac ab<1$
$1<\frac ab<\frac32$
None of these