6.A toy is made in the form of a hemisphere surmounted by a right circular cone whose base coincides with the plane surface of the hemisphere .The radius of the base of the cone is 1.5 m and its height is 4 m.The volume of the toy is

7.The area of a regular hexagon with side 10 cm is

8.P,Q,R and S are the middle points of the sides AB,BC ,CD and DA respectively of a square ABCD.AB=2 cm and arcs are drawn with centres at A,B,C and D with radius AP.Find the area of the portion of the square bounded by the four arcs.

9.A rocket is in the form of a right circular cylinder,closed at the lower end,with a cone of the same base radius attached to the top.The cylinder is of radius 2 1/2m and height 21 m,and the cone is of slant height 8m.The total surface area of the rocket is

10.A person sells a table at a profit of 20%.If he had bought it at 10% less cost and sold for Rs.105 more,he would have gained 35%.The cost price of the table is