Question

the length of a rectangle is increase by 15% and the breath reduce by 15% . lets work out the percentage the increase or decrease of area​

Answer 1

Step-by-step explanation:

LET THE LENGTH AND BREADTH BE L AND B.

SO THE AREA IS LB.

NEW LENGTH AFTER INCREASED BY 15% IS {(100+15)/100}*L

NEW BREADTH AFTER DECREASED BY 20% IS {(100–20)/100}*B

NEW AREA IS (115/100)*L*(80/100)*B

=0.92 LB

PERCENTAGE CHANGE IS {(LB-0.92 LB)/(LB)}*100

=8%

hope this maybe helps

Answer 2

$\huge \fbox \pink{Answer✪}$

$\text{Let length be I and breadth be b}$

$\text{Area = lb}$

$\textbf{New Length = } \frac{115l}{100} = \frac{23}{20}$

$\textbf{New Breadth = } \frac{85b}{100} = \frac{17b}{20}$

$\textbf{New Area = } \frac{lb.23.17}{400}$

$= lb. \frac{391}{400}$

$\text{There is decrease of } \frac{9}{400} \text{which is equal to} 2.25\%$

$\\ \\ \\ \\ \sf \colorbox{lightgreen} {\red★ANSWER ᵇʸɴᴀᴡᴀʙ⌨}$