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Subject Mathematics
301. The rainfall in January and February was 2.5 inches and 4.0 inches respectively. What was the percentage in rainfall in February?
305. In a set of three numbers, the average of first two numbers is 2, the average of the last two numbers is 3, and the average of the first and the last numbers is 4. What is the average of three numbers?
306. In 2007, the arithmetic mean of the annual incomes of Rahim and Karim was Taka 3800. The arithmetic mean of the annual incomes of Karim and Rinpon was Taka 4800, and the arithmetic mean of the annual incomes of Ripon and Rahim was Taka 5800. What is the arithmetic mean of the incomes of the income of the three?
307. Bank X pays a simple interest of Taka 80 on a principal of Taka 1,000 annually. Bank Y pays a simple interest of Taka 140 on a principal of Taka 1,000 annually. What is the ratio of the interest rates of Bank X to Bank Y?
308. Robi takes 3 minutes to inspect a car, and Sashi takes 4 minutes to inspect a car. If they both start inspection different cars at 8:30AM, what would be the ratio of the numbers of cars inspected by Robi and Sashi by 8:54 AM of the same day?
311. The total cost of Taka 1200 is deposit in two saving accounts for one year, part at 5% and the remainder at 7%. If Taka 72 was earned in interest, how much was deposited at 5%?
312. The total income of Mr. Sakib in the year 2003, 2004 and 2005 was Taka 36,400. His income increased by 20% each year. What was his income in 2005?
314. এক ব্যক্তি একটি দ্রব্য ১২০০ টাকায় কিনে ১৫% লাভে বিক্রয় করল; ক্রেতা ঐ দ্রব্য তৃতীয় এক ব্যক্তির কাছে ৫% ক্ষতিতে বিক্রয় করল। শেষ বিক্রয়মূল্য কত ছিল?
315. চালের দাম ২৫% বেড়ে যাওয়ায় এক ব্যক্তি চালের ব্যবহার এমনভাবে কমালেন যেন তাঁর বাৎসরিক ব্যয় অপরিবর্তিত থাকে। তিনি চালের ব্যবহার শতকরা কত ভাগ কমালেন?