= If Q(b, c, d) = b + cd and b is increased by 33/3% while c and d are increased by 60% and decreased by 16% respectively, then find the percentage change in Q(b, c, d).
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A number is increased by 20% and the increased number is decreased by 20%.Find the increase or decrease percent.
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Let the number be =100
Increase in the number =20% of 100
=
100
20
×100
=20
Increased number =100+20
=120
The resulting number decreased by 20%
Decrease in the number =
120
20
×120
=24
New number =120−24
=96
Now, net decrease =100−96
Net % decrease =
Original number
Net decrease
×100
=
100
4
×100
=4%
Hence the net percent decrease is 4%.