Question

The strength of a school increased by 20% in one year , and decreased by 20% in the next year . Is the final strength greater or less than the original one , and by how much percent?​

Answer 1

Answer:

the strength of the school decreased by 4%

Step-by-step explanation:

let the strength of the school before increase is 100

then after increase of 20% it will become- 100+100*20%

=100+100*20/100

=100+20

=120

then the strength of the school after increase is 120

then it decreased by 20%

so 120-120*20%

=120-120*20/100

=120-120*20/100

=120-24

=96

now the strength of the school is 96

at first the strength of the school is 100 and now it is 96

hence it is decreased by (100-96) =4

percentage of decrease=

amount of decrease/amount of strength at first*100

=4/100*100

=4%

hence the strength of the school is decreased by 4%

Answer 2

Answer:

Color, or colour, is the characteristic of visual perception described through color categories, with names such as red, orange, yellow, green, blue, or purple. This perception of color derives from the stimulation of photoreceptor cells by electromagnetic radiation. 

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