Question

The lenght of a rectangle is decreased by 30% and its breadth is increases by 15%, then what is the percentage change in its area is?

Answer 1

30-15-(30×15)/100

15-450/100

1500-450/100

1050/100

10.5%

Answer 2

Answer: 29%

Step-by-step explanation:

Since change in area is given by

                                              A + B + (AB/100)

Therefore, we have

change in area =(-30)+(15)+(-30*15/100)

                          = -29

since the sign is negative therefore area is decreased by 29%.

(thank you)