formula for rate:

percentage ÷ base

formula for base:

percentage ÷ rate

formula for percentage:

base × rate

__________________________

1.) 30% of N is 24

rate: 30%

base: ?

percentage: 24

formula for finding the base:

percentage ÷ rate

before dividing, change the rate to its decimal form first

30% ➜ 0.30 or 0.3

divide the percentage by the rate

24 ÷ 0.30 = 80

rate: 30%

base: 80

percentage: 24

30% of 80 is 24

_________________________

2.) N is 20% of 12000

rate: 20%

base: 12000

percentage: ?

formula for finding the percentage:

base × rate

change the rate to its decimal form

20% ➜ 0.20 or 0.2

12000 × 0.20 = 2400

rate: 20%

base: 12000

percentage: 2400

2400 is 20% of 12000

_________________________

3.) 26 is 50% of N

rate: 50%

base: ?

percentage: 26

50% ➜ 0.50 or 0.5

formula for finding base:

percentage ÷ rate

26 ÷ 0.50 = 52

rate: 50%

base: 52

percentage: 26

26 is 50% of 52

________________________

4.) 60 is N% of 80

rate: ?

base: 80

percentage: 60

formula for finding the rate:

percentage ÷ base

60 ÷ 80 = 0.75

0.75 ➜ 75%

rate: 75%

base: 80

percentage: 60

60 is 75% of 80

_______________________

5.) 25% of N is 30

rate: 25%

base: ?

percentage: 30

25% ➜ 0.25

formula for finding the base:

percentage ÷ rate

30 ÷ 0.25 = 120

rate: 25%

base: 120

percentage: 30

25% of 120 is 30

______________________