The following table gives the wages of workers in a factory:

Wages in Rs.	45-50	50-55	55-60	60-65	65-70	70-75	75-80
No. of workers	5	8	30	25	14	12	6

Calculate the mean by the short cut method.

Amit Kumar invests Rs. 36,000 in buying Rs. 100 shares at Rs. 20 premium. The dividend is 15% per annum. Find:

The number of shares he buys

His yearly dividend

The percentage return on his investment. Give your answer correct to the nearest whole number.

What sum of money will amount to Rs. 9,261 in 3 years at 5% per annum compound interest?

Mr. Mishra has a Savings Bank Account in Allahabad Bank. His pass book entries are as follows:

Date	Particulars	Withdrawals (in Rs.)	Deposits (in Rs.)	Balance (in Rs.)
Jan. 4, 2007	By Cash	-	1000.00	1000.00
Jan. 11, 2007	By Cheque	-	3000.00	4000.00
Feb. 3, 2007	By Cash	-	2500.00	6500.00
Feb. 7, 2007	To Cheque	2000.00	-	4500.00
March 3, 2007	By Cash	-	5000.00	9500.00
March 25, 2007	By Cash	-	2000.00	11,500.00
June 7, 2007	By Cash	-	3500.00	15000.00
Aug. 29, 2007	To Cheque	1000.00	-	14000.00

Rate of interest paid by the bank is 4.5% per annum. Mr. Mishra closes his account on 30th October, 2007. Find the interest he receives.

The given figure represents a hemisphere surmounted by a conical block of wood. The diameter of their bases is 6 cm each and the slant height of the cone is 5 cm. Calculate:

the height of the cone.

the volume of the solid.

Attempt this question on graph paper.
Marks obtained by 200 students in examination are given below:

Marks	0-10	10-20	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
No. of Students	5	10	14	21	25	34	36	27	16	12

Draw an Ogive for the given distribution taking 2 cm = 10 marks on one axis and 2 cm = 20 students on the other axis. From the graph find: