A piece of equipment, which was calculated to have 3 years of life, was purchased by a company in March 2005 for $80000. After 3 years, the residual value shall be $20000. Calculate the depreciation expenses for 2005, 2006 and 2007 using the straight line depreciation method.

The cost of making a table is divided between materials, workers and transporters in the ratio of 5:6:1. If the cost of the table is $312, what will be the material cost of the table?

Find out the missing number in the following: 9/5 : 7/4 : : 3/5 : ______

Calculate the compound interest compounded half yearly for 1 year on $10000 at an interest rate of 6% per annum.

Andy takes a loan of $10000 from a bank for a period of 3 years at 10% annual rate of interest. Calculate his EMI(Equated Monthly Installment).

Adam and Brian start a business. Twice the investment made by Adam is equal to thrice the investment of Brian. Calculate Brian's share if there is a profit of $2500 in the business.

The true discount for an amount of $3100, due 6 months hence is $100. Calculate the rate percent of interest.

A banker's discount on $2000 at 10% is equal to a true discount on $3000. If the time and the rate are the same, calculate the time.

Calculate the composite depreciation rate from the following table:

Find the selling price of an article when the cost price is $50 and the gain is 20%?

George and Michael start a business by investing $15000 and $20000 respectively. Michael leaves the business after 5 months but does not take back his invested amount while leaving. Samuel joins the same business after 5 months by investing $10000. There is a profit of $4000 at the end of the year. What is Samuel's share in the profit?