This document provides an introduction and lesson on percentages. It includes: - An introduction to the mathematics department and chapter on profit and loss. - Learning outcomes which are to explain percentages and calculate basic percentages without a calculator. - Examples of calculating 30% of Tk. 40 and 75% of Tk. 600 are shown step-by-step. - A chart reviewing common percentages is included. - Homework is assigned to solve two questions from exercise 2.1.

1. Welcome
Md. Abdul Quddus
Department: Mathematics
Campus : 05

2. Chapter : Two
Profit & Loss

3. Learning outcome
After this lesson students . . .
• will be able to explain percentage
• Calculate basic percentage without a
calculator.

4. Remember the following chart !
100% 50%
1
33 %
3
2
66 %
3
20% 40% 60% 80%
1
1
2
1
3
2
3
1
5
2
5
3
5
4
5
10% 30% 70% 90%
1
10
3
10
7
10
9
10
Percentages

5. Question. Find 30% of Tk.40
3
40
10

40 ÷10 x 3 =12
Percentages

6. Question: Find 75% of Tk. 600
3
600
4

600 ÷ 4 x 3 = 450
Percentages

7. Now try
Percentages
100Tkof%
2
1 .

8. Home work
 solve exercise 2.1 – Question 7,8

9. Thank you