document.write( "Question 865292: I have a final exam tomorrow and these are two problems I am having a problem with on my review. If someone could show me how to do them it would be much appreciated.\r
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document.write( "-Problem 1-\r
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document.write( "You inherit $2500 with the stipulation that for the first year the money must be involved into two stocks paying 10% and 6% annual interest, respectively. How much should be invested at the 6% rate if the total interest earned for the year is to be $221.92?\r
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document.write( "-Problem 2-\r
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document.write( "After an 8% increase in salary, Laurie makes 1016.50 per month. How much did she earn per month before the increase?\r
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document.write( "Any help would really be great thank you.
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Algebra.Com's Answer #521660 by mananth(16946)![]() ![]() You can put this solution on YOUR website! Part I 6.00% per annum ------------- Amount invested =x \n" ); document.write( "Part II 10.00% per annum ------------ Amount invested = y \n" ); document.write( " 2500 \n" ); document.write( "Interest----- 221.92 \n" ); document.write( " \n" ); document.write( "Part I 6.00% per annum ---x \n" ); document.write( "Part II 10.00% per annum ---y \n" ); document.write( "Total investment \n" ); document.write( "x + 1 y= 2500 -------------1 \n" ); document.write( "Interest on both investments \n" ); document.write( "6.00% x + 10.00% y= 221.92 \n" ); document.write( "Multiply by 100 \n" ); document.write( "6 x + 10 y= 22192.00 --------2 \n" ); document.write( "Multiply (1) by -6 \n" ); document.write( "we get \n" ); document.write( "-6 x -6 y= -15000.00 \n" ); document.write( "Add this to (2) \n" ); document.write( "0 x 4 y= 7192 \n" ); document.write( "divide by 4 \n" ); document.write( " y = 1798 \n" ); document.write( "Part I 6.00% $ 702 \n" ); document.write( "Part II 10.00% $ 1798 \n" ); document.write( " \n" ); document.write( "CHECK \n" ); document.write( "702 --------- 6.00% ------- 42.12 \n" ); document.write( "1798 ------------- 10.00% ------- 179.80 \n" ); document.write( "Total -------------------- 221.92 \n" ); document.write( " \n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( " \n" ); document.write( "suppose she gets 108 after increase originally she would have got 100\r \n" ); document.write( "\n" ); document.write( "1016.50----------------------------------------?\r \n" ); document.write( "\n" ); document.write( "(100/108)* 1016.50= $941.20 \n" ); document.write( " |