percentages:

Question 1

one amount as a % of the other amount (wants answer as a %):

Answer 1

a as a percentage of b
a/b x 100
-look for the words as a percent of

Question 2

percentage gain/loss (wantes answer as a %):

Answer 2

difference/original x 100
-looks for the words percentage gain/loss/increase/decrease

Question 3

find percentage of an amount:

Answer 3

%/100 x amount

Question 4

given % of an amount, find the full amount:

Answer 4

given amount/%/100

Question 5

increasing/decreasing by a %:

Answer 5

amount (1+- %/100)
+ if increase
-if decrease

Question 6

given % of an amounr after amount has been added or subtracted, find the full amount:

Answer 6

amount/1+-%/100
+ if increase
- if decrease
-look for the words originally, at the beginning, before…

Question 7

simple interest (interest on initial amount):

Answer 7

amount + (amount x %/100 x time)
interest = amount x %/100 x time
-note: make sure t and % are the same unit of time

Question 8

compound interest (interest added also earns interest):

Answer 8

FV = PV (1 + r/100)ᵗ
FV = future value, PV = present value
t = time, r = interest rate