TYPE I: FINDING THE PART
EXAMPLE:Find 30% of 18.
SOLUTION:Since 30% is the rate, place it in the lower left portion of the
circle, and since 18 is the base, place it in the lower right portion of the circle
and then multiply. See Figure RIII-3.
P¼RP
¼ 30 % 18
¼ 0 : 30 18
¼ 5 : 4
Note: The number after the word ‘‘of ’’ is the base.
TYPE 2: FINDING THE RATE
EXAMPLE:12 is what percent of 20?
SOLUTION:Since 12 is the part, place it in the top portion of the circle, and
since 20 is the base, place it in the lower right portion of the circle, and then
divide. See Figure RIII-4.
R¼
P
B
¼
12
20
¼ 0 : 60 ¼ 60 %
Fig. RIII-3.REFRESHER III Percents 39