9. (a) Mohan deposits Rs. 80 per month in a cumulative deposit account for six years. Find the amount payable to him on maturity, if the rate of interest is 6% per annum.   10. (b) A rectangular playground has two semicircles added to its outside with its smaller sides as diameters. If the sides of the rectangle are 120 m and 21 m, find the area of the playground. (π = 22/7)   11. (c) Use graph paper for this question. The points A (2, 3), B (4, 5) and C (7, 2) are the vertices of ΔABC. (i) Write down the coordinates of A', B', C' if triangle ΔA'B'C' is the image of ΔABC, when reflected in the origin.   12. (ii) Write down the coordinates of A", B", C" if triangle ΔA"B"C" is the image of ΔABC, when reflected in the x-axis.   13. (iii) Mention the special name of the quadrilateral BCC"B" and find its area. (Type in the answers separated by commas. Leave no spaces around the commas.)