1. Additional Example 1 Additional Example 2
3.1 Rate
Additional Example 1
Additional Example 2

2. Additional Example 1 Find the rate of the following.
(a) The total rent of a flat for two years is $ (Unit: $/month)
Solution
(b) Miss Lee types 125 words in 150 seconds. (Unit: words/min)
Solution

3. Solution (a) Rate = $[163 200  (12  2)] / month
Additional Example 1
Find the rate of the following.
(a) The total rent of a flat for two years is $ (Unit: $/month)
(b) Miss Lee types 125 words in 150 seconds. (Unit: words/min)
Solution
(a)
Rate
= $[  (12  2)] / month
= $(  24) / month
Q1(b)
= $6 800 / month

4. Solution (b) Rate = (125  ) words / min = (125  ) words / min
Additional Example 1
Find the rate of the following.
(a) The total rent of a flat for two years is $ (Unit: $/month)
(b) Miss Lee types 125 words in 150 seconds. (Unit: words/min)
Solution
(b)
Rate
= (125  ) words / min
= (125  ) words / min
= 50 words / min

5. Additional Example 2
Suppose we can exchange 5 Australian dollars for HK$21.
(a) How much Australian dollars can we exchange with HK$1? (Give the answer correct to 2 decimal places.)
Solution
(b) How much Hong Kong dollars can we exchange with 1 Australian dollar?
Solution

6. Additional Example 2
(c) How much Australian dollars can we exchange with HK$189?
Solution

7. Solution (a) HK$1 = Australian dollar = 0.24 Australian dollar
Additional Example 2
Suppose we can exchange 5 Australian dollars for HK$21.
(a) How much Australian dollars can we exchange with HK$1? (Give the answer correct to 2 decimal places.)
(b) How much Hong Kong dollars can we exchange with 1 Australian dollar?
(c) How much Australian dollars can we exchange with HK$189?
Solution
HK$1 = Australian dollar
(a)
= 0.24 Australian dollar
 We can exchange 0.24 Australian dollar with HK$1.
Q2(b)

8. Solution (b) 1 Australian dollar = HK$ = HK$4.2
Additional Example 2
Suppose we can exchange 5 Australian dollars for HK$21.
(a) How much Australian dollars can we exchange with HK$1? (Give the answer correct to 2 decimal places.)
(b) How much Hong Kong dollars can we exchange with 1 Australian dollar?
(c) How much Australian dollars can we exchange with HK$189?
Solution
1 Australian dollar = HK$
(b)
= HK$4.2
 We can exchange HK$4.2 with 1 Australian dollar.
Q2(c)

9. Solution (c) HK$189 = 189  Australian dollars = 45 Australian dollars
Additional Example 2
Suppose we can exchange 5 Australian dollars for HK$21.
(a) How much Australian dollars can we exchange with HK$1? (Give the answer correct to 2 decimal places.)
(b) How much Hong Kong dollars can we exchange with 1 Australian dollar?
(c) How much Australian dollars can we exchange with HK$189?
Solution
HK$189 = 189  Australian dollars
(c)
= 45 Australian dollars
 We can exchange 45 Australian dollars with HK$189.