Suresh earned an interest of Rs. 903 on principal amount of Rs. 2800 at some rate of compound interest in 2 years. How much more/less interest would he have earned on Rs. 3200 at the same rate of simple interest for the same duration?
Let, rate of interest be ‘r’% per annum So, 903 = 2800 × {(1 + r/100)2 – 1} 129/400 = {(1 + r/100)2 – 1} 529/400 = (1 + r/100)2 (23/20)2 = (1 + r/100)2 23/20 = 1 + r/100 3/20 = r/100, r = 15 So, simple interest earned = 3200 × 0.15 × 2 = Rs. 960 Required amount = 960 – 903 = Rs. 57
I. x³= ((4)5+ (15)³)/(3)4
II. 8y³=(-13)3÷ √1521+ (3y)³
I. x2 + 12√2 x + 22 = 0
II. y2 - 13√2 y – 28 = 0
What is the speed of the stream if a ship takes 15 hours to travel 240 km in calm waters, given that the ratio of its speed against the current to its s...
I. 2y² - 3y – 14 = 0
II. 3x² - 7x + 4 = 0
I. 2x² - 11x + 12 = 0
II. 12y² + 29y + 15 = 0
I. 3x² - 22 x + 40 = 0
II. 4y² + 22y + 24 = 0
I. 3y2 + 13y - 16 = 0
II. 3x2 – 13x + 14 = 0
I. 84x² - 167x - 55 = 0
II. 247y² + 210y + 27 = 0
I. 6x² + 37x + 45 = 0
II. 3y² - 11y + 6 = 0
I.√(3x-17)+ x=15
II. y+ 135/y=24
