Two sides of a parallelogram are 20 cm and 25 cm. If the altitude corresponding to the sides of length 25 cm is 10 cm, then the altitude corresponding to the other pair of side is
A certain sum is certain time become Rs. 500 at the rate of 8% per annum simple interest and the same sum amount to Rs. 200 at the rate of 2% simple interest in the same duration. Find the time
Two villagers are 2 km apart. If the angles of depression of these villagers when observed from a plane are found to be 45� and 60� respectively. Then the height of plane is
A cone of height 7 cm and base radius 1 cm is carved from a cuboidal block of wood 10 cm $\times$ 5 cm $\times$ 2 cm. Assuming $\pi$ = $22 \over 7$, the percentage wood wasted in the progress is