64. A sum of Rs. 91,00 is borrowed at 20% per annum compounded annually. If the amount is to be paid in two years, the amount will be?
65. A man spends 28% of his salary on food. From the remaining, he spent 1/6th on rent and sends 3/8th to his mother. If he left with Rs 5280, what amount he sends to his mother.
66. The average age of a husband and wife was 23 years when they were married 5 years ago. The average age of the husband, the wife and a child who was born during the interval, is 20 years now. How old is the child now?
68. Total distance between A and B is d kms. If the distance travelled along the stream is three time of the total distance and the distance travelled against the stream is two times of the total distance. If the time taken to cover the distance along the stream is 10% less then the time taken to cover the distance against the stream. If a person cover a distance of 21 km in 1 hr 24 min along the stream, then find the rate of current?
69. P and Q started a business by investing Rs. 15,000 and Rs.18,000 respectively. After four months R joined the business with a capital of Rs. 10,000. After two more months, Q left the business with his capital. At the end of the year, P got a share of Rs. 4,500 in the profit. What is the total profit earned?
70. Inside a square plot, a circular garden is developed which exactly fits in the square plot and the diameter of the garden is equal to the side of the square plot which is 28 metre. What is the area of the space left out in the square plot after developing the garden?
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