Decimal uses in money values

The value of money varies :

Use of decimals in measures of lengths

INTEREST The additional money paid by the borrower to the lender for having used his money is called the interest.

Using binomial theorem find the value: (1)(0.999)^(4) [correct to three places of decimals]

Using binomial theorem, find the value of (0.99)^(15) up to four places of decimal.

Decimals as an extension of place value table

Find the value of sqrt5 , corresct to two decimal places. Use this value to evalute 3/sqrt5 , correct to two significant figures.