Question

a number is increased by 20% amd then decreased by 15%.find the net increase or decrease. does it make any difference if it is 15% decreased first then 20 % increased​

Answer 1

Answer:

Step-by-step explanation:

Let the number=1000x

Number after 20% increase=1000x=20*1000x/100

= 1000x+200x =1200x

Now after 15% decrease

=1200x-15*1200/100=1200x-180x=1020x

hence net increase=20x*100/1000x= 2% raiser

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No taking 15% first

Number after 15% increase=1000x+15*1000x/100

= 1000x+150x =1150x

Now after 20% decrease

=1150x-1150*20/100=1150x-230x=920x

here is the decrease=1000x-920x=80x

% decrease=80x*100/1000x=8%