High School

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Choose the correct answer from the given four alternatives.

1. In a school, 58% of the total number of students are boys. If the number of girls is 840, how many students are there in the class?
- a. 2000
- b. 1800
- c. 1500
- d. 2100

2. Birr 300 is invested at 6% simple interest per annum. How long will it take for the interest to amount to Birr 180?
- a. 12 years
- b. 10 years
- c. 8 years
- d. 24 years

3. The decimal form of 672.937% is:
- a. 6.72937
- b. 67.2937
- c. 672.937
- d. 6729.37

4. The simple interest on Birr 400 invested for 4 months was Birr 12. What is the annual (yearly) rate of interest?
- a. 36%
- b. 4.8%
- c. 7%
- d. 9%

Answer :

Answer:

1. a. 2,000

2. b. 10 years

3. a. 6.72937

4. d. 9%

Step-by-step explanation:

1. If 58% are boys, the percentage of girls is:

= 100 - 58

= 42%

That means 840 is 42% of the students in class. The students in class are therefore:

= 840 / 42%

= 2,000 students

2. If Birr 300 is invested at 6% per year, the amount in interest it earns per year is:

= 300 * 6%

= Birr 18

To get to Birr 180, it would take:

= 180/18

= 10 years

3. When a number is in percentage that means that it is a fraction with the denominator being 100. The number is decimal will therefore be it divided by 100:

= 672.937/100

= 6.72937

4. The investment accrued Birr 12 out of Birr 400 in 4 months. This means that it increased by:

= 12/400

= 3%

A year can be divided into three by 4 months. This means that the yearly rate is therefore:

= 3% * 3

= 9%

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