TYPE II: FINDING THE RATE (%)
In type II problems, you are given the part and the whole and are asked to
find the rate as a percent. The answer obtained from the formula will be in
decimal form. Make sure that you change it into a percent.EXAMPLE:A person bought a DVD player for $78 and paid a sales tax of
$4.68. Find the tax rate.SOLUTION:GOAL: You are being asked to find the rate (%).STRATEGY: In this case, the base (B) is the total cost, which is $78, and
the sales tax, $4.68, is the part. Draw the circle and put $78 in the lower
right portion and $4.68 in the top portion. To find the rate, useR¼PB.
See Figure 5-4.IMPLEMENTATION:
R¼
P
B
R¼
4 : 68
78
R¼0.06¼6%
The sales tax rate is 6%.EVALUATION: To check the answer, find 6% of $78: 6% 78 ¼
0.06 78 ¼ $4.68. The answer is correct.Fig. 5-4.46 LESSON 5 Using Percents