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Subject Mathematics
401. The average of 100 observations in a study was calculated as 49.7. Later it was revealed that one of the observations was misread as 64 instead of 94. What will be the correct average?
403. Selim deposited a total of taka 120,000 in two savings accounts for one year. One account offered him 8% interest and the other 10%.If he earned take 10,000 as interest, how much did he deposit at 8%?
405. Farhana deposited Tk. 10,000 in a Bank at 13.25% interest rate compounded annually. At the end of the second year, the total amount including interest will become how much?
406. A bookseller can gain 6.666% if the offers a 20% commission on the written selling price of a book .if the commission is reduced to 10%, what will be his gain?
410. Rumi and Rony can finish a task, working together, in 12 days if Rony alone can finish that in 20 days, how many days will Rumi need to finish the task working alone?
411. The average age of 40 employers in a branch of a bank is 35 years. When a new employee joined the bank the average age increased to 35.5 years. What is the age of the new employee?
In the following table the sales of June 2009 of a particular automobile company is depicted. Answer below two questions based on the data provided in the table below:
412. People use Sedan car and Micro bus for only personal usage. Of all the automobiles sold during that period what percent will be used solely for persona usage?
414. In a departmental store, notebooks that are normally sold for Tk. 59 each are on sale at 2 for Tk. 99 How much can be saved by purchasing 12 of these notebooks at the sale price?
417. Pallab has exactly 3 times as many Bangladeshi as non �Bangladeshi stamps in his collection. Which of the following cannot be the number of stamps in Pallab�s collection?
418. The cost of manufacturing x water pumps is Tk. 9000+400x. The amount received by selling these x water pumps is Tk. 500x. Water is the least number of water pumps that must be manufactured and sold so that the amount received is at least equal to the manufacturing cost?
419. If Tk. 6,300 was invested in a share when the price per share was Tk. 9 and additional Tk. 4,200 was invested in the same share when the price per share was Tk. 10, what was the average price per share?
420. In a certain country, a person in born every 5 seconds and a person dies every 13 seconds. Therefore the birth and death rates account for a population growth rate of one person every---.
421. average of a set of 12 number, which includes 34 is removed from the set and 38 is included to the set, what is the average of the new set of number in terms of A ?
422. A buzzer sounds every 15 minutes. If the buzzer sounded at 12 :40 PM, which of the following could be a time at which the buzzer had sounded before?
423. A number consists of two digits. If the digits interchange places and the new number is added balls be drawn from the box, if at lest one black ball is to be included in the draw?
424. A box contains 2 while balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at last one blank ball is to be included in the draw?
425. A bank offers 5% compound interest calculated on half-yearly basis, A customer deposits Tk. 1600 each on 1st January and 1st July of a year. At the end of the year, how much he would have gained as interest?