21: A shopkeeper offers a discount of 20% on the marked price of an item. If the customer pays Birr 640 for the item after availing the discount, what is the marked price of the item?
22: The ratio of the ages of Kebede and Gemechu is 3:5. If the sum of their ages is 64 years, what is Gemechu's age?
23: The population of a town is 50,000. If the population increases by 8% annually, what will be the population after 3 years?
24: A sum of money invested at a simple interest rate of 8% per annum becomes Birr 9,600 in 4 years. What is the principal amount?
25: If the selling price of an item is Birr 800 and the profit percentage is 25%, what is the cost price of the item?
26: The simple interest on a certain sum of money at a rate of 8% per annum for 3 years is Birr 960. What is the principal amount?
27: The average of five numbers is 24. If three of the numbers are 18, 22, and 26, what is the sum of the remaining two numbers?
28: A box contains 30 red balls and 40 blue balls. If one ball is drawn at random, what is the probability of drawing a red ball?
29: A rectangular field has a length that is twice its width. If the perimeter of the field is 36 meters, what is its area?
30: A firm sells widgets for Birr 14 each. The variable costs for each unit is Birr 8. The contribution margin per unit is:
31: Company A’s fixed costs were Birr 42,000, its variable costs were Birr 24,000, and its sales were Birr 80,000 for the sale of 8,000 units. The company’s break-even point in units is:(Hint: Break even happens when total cost=total revenue)
32: Janet sells a product for Birr 6.25. The variable costs are Birr 3.75. Janet’s break-even units are 35,000. What is the amount of fixed costs?
33: A wrapping paper Company produced 2000 rolls of paper one day at a standard price of Birr. 1 per roll. Labor cost was Birr. 160, material cost was Birr. 50, and overhead was Birr. 320. Determine the multifactor and total productivity.
34: The cost of 8 pens and 4 pencils is Birr 84, while the cost of 5 pens and 3 pencils is Birr 51. What is the cost of 1 pen and 1 pencil?
35: A two spinning machines A and B can together produce 300,000 meters of cloth in hours. If machine B can produce the same amount of cloth in 15 hours, then how much cloth machine A can produce in 10 hours?
36: Two students appeared at an examination. One of them secured 9 marks more than the other and his marks was 56% of the sum of their marks. The marks obtained by them are:
37: The effective annual rate of interest corresponding to a nominal rate of 6% per annum payable half-yearly is;
38: A train travels a distance of 540 km at a constant speed. If it takes 6 hours to cover two-thirds of the distance, how long will it take to cover the remaining one-third of the distance?
39: If 3 workers can complete a task in 6 days, how many days will it take for 5 workers to complete the same task?
40: A man spends 40% of his salary on rent, 20% on groceries, and saves the remaining Birr 8,000. What is his monthly salary?