document.write( "Question 868697: I am tutoring a student and should probably know how to get this, but so far we have not come up with the correct solution:\r
\n" ); document.write( "\n" ); document.write( "Jose borrows $400 from his brother to fix his car. His brother doesn't like lending Jose money and so charges him 3% interest per month. \r
\n" ); document.write( "\n" ); document.write( "Write a rule in the \"y=...\" form that will give the amount of money, y, Jose will owe his brother after n months, assuming that he doesn't make any payments.\r
\n" ); document.write( "\n" ); document.write( "We thought it would be y=$400 x .03n, however, she missed it on the test and has the opportunity to correct it as homework. Can you assist with the formula we should use please.\r
\n" ); document.write( "\n" ); document.write( "Thank you so much!
\n" ); document.write( "Devona White
\n" ); document.write( "

Algebra.Com's Answer #523779 by Theo(13342)\"\" \"About 
You can put this solution on YOUR website!
I understand the problem as:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Jose borrows $400 from his brother to fix his car. His brother doesn't like lending Jose money and so charges him 3% interest per month.
\n" ); document.write( "Write a rule in the \"y=...\" form that will give the amount of money, y, Jose will owe his brother after n months, assuming that he doesn't make any payments.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The answer depends on whether this is simple interest or compound interest.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "If it is simple interest, then the answer will be:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "y = $400 + $400 * .03*n\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "It's the same formula you used only you forgot to include the principal that has to be repaid.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "If he is charging you compound interest, then you will be paying interest on the interest that has accrued and you will owe more at the end.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "In the compound interest case, the formula will be y = $400 * (1.03)^n.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );