document.write( "Question 130158: Hi,
\n" ); document.write( "Not sure if this is correct, but is the answer 52,000? I am thinking that the problem should be set up as follows:
\n" ); document.write( "650,000 x 4% for two years...therefore 650,000x8%????
\n" ); document.write( "Question:
\n" ); document.write( "If 650,000 is invested in an account paying simple annual interest, how much interest will be earned in two years at the annual rate of 4%?
\n" ); document.write( "

Algebra.Com's Answer #95084 by bucky(2189)\"\" \"About 
You can put this solution on YOUR website!
You make a little more than that.
\n" ); document.write( ".
\n" ); document.write( "You can look at the problem in two stages. The first year you have $650,000 invested at
\n" ); document.write( "a simple interest rate of 4% (or 0.04) which, because simple interest is used, is paid at the
\n" ); document.write( "end of the year. At the end of the first year you have your principal plus 4% of the principal.
\n" ); document.write( "So you actually have 1.04 of your principal at the end of the year. This can be calculated as:
\n" ); document.write( ".
\n" ); document.write( "($650,000)*(1.04) = $676,000
\n" ); document.write( ".
\n" ); document.write( "Therefore, during the second year, you will have $676,000 invested at 4%. So similarly to
\n" ); document.write( "the first year you can multiply the principal times 1.04 to find your worth at the end of the
\n" ); document.write( "second year. So for the second year you find your worth by multiplying $676,000 by 1.04 and
\n" ); document.write( "you get:
\n" ); document.write( ".
\n" ); document.write( "($676,000)*(1.04) = $703,040
\n" ); document.write( ".
\n" ); document.write( "Then you find the interest you made during the two years by subtracting your original
\n" ); document.write( "investment from your worth at the end of the second year to find that your total interest
\n" ); document.write( "for the two-year period is:
\n" ); document.write( ".
\n" ); document.write( "$703,040 - $650,000 = $53,040
\n" ); document.write( ".
\n" ); document.write( "Another way you can look at this is that at the end of the first year your investment is
\n" ); document.write( "worth:
\n" ); document.write( ".
\n" ); document.write( "($650,000)*(1.04)
\n" ); document.write( ".
\n" ); document.write( "Then to find your worth at the end of the second year, you multiply what you have at the
\n" ); document.write( "end of the first year by 1.04. This means that at the end of the second year you have:
\n" ); document.write( ".
\n" ); document.write( "(($650,000)*(1.04))*(1.04)
\n" ); document.write( ".
\n" ); document.write( "This can be simplified to:
\n" ); document.write( ".
\n" ); document.write( "($650,000)*(1.04)^2
\n" ); document.write( ".
\n" ); document.write( "With a little more thought you can extend this into a formula for simple interest. Let
\n" ); document.write( "\"P\" represent your initial investment (the principal), \"I\" represent the annual interest rate as
\n" ); document.write( "a decimal, and \"N\" represent the number of years the principal and the interest are left to
\n" ); document.write( "accumulate. At the end of N years your account will contain an amount A as follows:
\n" ); document.write( ".
\n" ); document.write( "A = P*(1 + I)^N
\n" ); document.write( ".
\n" ); document.write( "Just subtract P (original investment) from A (amount after N years) and you will have the interest
\n" ); document.write( "that you have made during the N years.
\n" ); document.write( ".
\n" ); document.write( "Hope this helps you to understand the problem.
\n" ); document.write( ".
\n" ); document.write( "
\n" ); document.write( "
\n" );