sixty
25 to 40 multiply both by 4
then becomes 100 to 160
and 160 - 100 = 60
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It is a 60% increase
50
25%
16 to 40 is a 150% increase.
Find the difference between the first number and the second number and divide by the first number then change to a percent. 50-40=10 10/40=.25 or 25 percent increase. Don't forget to divide by the beginning amount because 50 to 40 is different.