what is the rate of interest p.c.p.a?

I. Difference between the compound interest and simple interest earned in two years on the amount invested is INR 100/-

II. The amount becomes INR 19,500/- in three years on simple interest.

III. Simple interest accured in two years on the same amount at the same rate of interest is INR 3,000/-

A shopkeeper labeled the price of his articles so as to earn a profit of 30% on the cost price. He then sold the articles by offering a discount of 10% on the labeled price. What is the actual percent profit earned in the deal?

Amit and Sujit together can complete an assignment of data entry in 5 days. Sujit’s speed is 80% of Amit’s speed and the total key depressions in the assignment are 576000. What is Amit’s speed in key depressions per hour if they work for 8 hours a day ?

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 28m. what is the area of the space left out in the square plot after developing the garden?

^If the length of a rectangular field is increased by 20% and the breadth is reduced by 20%, the area of the rectangle will be 192 m². What is the area of the original rectangle ?

Father’s age is 30years more than the son’s age. Ten years hence the father’s age will become three times the son’s age that time. What is son’s present age in years ?