Question

A number is increased by 20% and then it is decreased by 20%. Find the net increase or decrease per cent.​

Answer 1

Answer:

Let the number be 100

20% increase means

$\cancel{100} \times \frac{120}{ \cancel{100}} \\ \\ = 120$

Then decreased above 120 of 20%

Then,

$12 \cancel0 \times \frac{8 \cancel0}{1 \cancel{00}} \\ \\ = 12 \times 8 = 96$

Hence value is 100-96=4

Hence answer is 4% decrease.

Hope it helps you from my side

Answer 2

Step-by-step explanation:

Answer:

Let the number be 100

20% increase means

$\begin{gathered} \cancel{100} \times \frac{120}{ \cancel{100}} \\ \\ = 120\end{gathered}$

Then decreased above 120 of 20%

Then,

$\begin{gathered}12 \cancel0 \times \frac{8 \cancel0}{1 \cancel{00}} \\ \\ = 12 \times 8 = 96\end{gathered}$

Hence value is 100-96=4

Hence answer is 4% decrease.

Hope it helps you from my side