document.write( "Question 1149493: Monthly sales figures for January are 5600. This is expected to fall for the following 9 months at a rate of 2% each month. Thereafter sales are predicted to rise at a constant rate of 4% each month. Estimate total sales for the next 2 years (including the first January). \n" ); document.write( "

Algebra.Com's Answer #770861 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "It can be done in 2 ways.\r\n" );
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document.write( "First way is to sum two geometric progressions, using standard formulas.\r\n" );
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document.write( "    First GP starts with 5600 (Jan) and has 9 following terms from 2 to 10 (Feb-Oct) inclusive, \r\n" );
document.write( "    that diminish with the common ratio of 0.98.\r\n" );
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document.write( "    Then this term    (Oct)  is the first term of the other, growing GP with the common ratio of 1.04.\r\n" );
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document.write( "    This second sequence continues to the 25-th term   inclusive, which corresponds to the last Jan.\r\n" );
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document.write( "          (It is how I understand the problem's description, although it is in fog in this part).\r\n" );
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document.write( "It is really boring way.\r\n" );
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document.write( "Another way is to do it in several clicks with Excel.\r\n" );
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document.write( "I did it in this way and got the ANSWER  148449.09.    ANSWER\r\n" );
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document.write( "Notice that I rounded at the very end and did not round on the way.\r\n" );
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