document.write( "Question 1157067: Sarah saves $400 the first month and every month later $45 more. John saves $4.35 the first month and every month later he doubles the amount. Who will have more after a year and a half? \n" ); document.write( "
Algebra.Com's Answer #779899 by greenestamps(13200)\"\" \"About 
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\n" ); document.write( "Sara: 400 + 445 + 490 + ... + 1120 + 1165 = 18((400+1165)/2) = 14085

\n" ); document.write( "John: 4.35+8.70+17.40+...+...

\n" ); document.write( "The amount John saves in the 17th month is

\n" ); document.write( "\"4.35%2A2%5E17+=+570163.20\"

\n" ); document.write( "Doubling the amount each month makes the total grow so fast that John could save a nickel ($0.05) the first month and still end up with more than Sara at the end of 18 months.

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