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percent —> decimal
divide percent by 100,
25% —> 25/100 = 0.25
find the percent of a number. ex: what is 20% of 50?
percent in decimal form x whole = part,
20% = 0.2,
0.2 × 50 = 10
__ is what percent of __?
(part / whole) x 100 = percent,
15 is what percent of 60?
15/60 = 0.25
0.25 × 100 = 25%
__ is __% of what number?
part / percent as a decimal = whole
10 is 20% of what number?
20% = 0.2
10/0.2 = 50
percent increase/derease
((new - old) / old ) x 100
price went from $60 to $40,
40-60/60 = -15/60 = -0.25 × 100 = 25% decrease
always remember
part = percent as a decimal x whole