# opposite increase decrease

• Jun 21st 2009, 10:08 PM
mathos
opposite increase decrease
hello

when an amount is increased by x%, what percentage y% is needed to decrease the increased amount in the initial amount?

for example 100 is increased by 5% and becomes 105
in which percentage is needed to decrease 105 to 100?

is there an equation that can calculate this?

thanks
• Jun 21st 2009, 10:37 PM
Stroodle
$\frac{5}{105}\times 100$