MATH DOSE 1

1.        In how many years the amount became double of itself at the rate of 10% per annum in simple interests.
   2.     If an article is bought in 400 and sell at 10% profit. What percentage of profit must be increase to sell the object at 460.
   3.     If a person deposit 5400 in a bank at the rate of 15/2% per annum. If withdraw 3200 after 6 month and withdraw rest money next 6 month. Find the total interest taken by the person.
   4.     If a person bought 240 rose at the rate of 9 rupees per dozen and sell 1 rupees per rose find the profit/loss percent.
   5.     If a person deposit some money on simple interest for 10% per annum for 2 year and interest will 100 rupees. If the same money deposit on compound interest find the interest.
   6.     If we add 75 in a 75% of a number it will equal to itself. Find the number.
   7.     5a+3b : 4a+7b = 3:4 then find a:b
   8.  If we make two equilateral triangles first on the base of side of square and second on the base of diagonal of the square find the ratio of area of first and second triangle.
   9.     If a/2=b/3=c/5 then find (4a+3b-c)/b
   10.   A sell a cycle to B at profit of 10% and B sell the cycle to C at profit of 20% and C pay 264 rupees for the cycle find the price at which A was bought the cycle.