document.write( "Question 891614: the salary of a Man starts at Rs 800 and increase annually by Rs 20 until a maximum of Rs 1120 is reached .Find the total amount of money earned by him when he serves 15 years and 22 years. \n" ); document.write( "
Algebra.Com's Answer #539984 by LinnW(1048)\"\" \"About 
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for 15 years
\n" ); document.write( "800 +
\n" ); document.write( "800 + 20 +
\n" ); document.write( "800 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 +
\n" ); document.write( "800 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20 + 20
\n" ); document.write( "= amount earned in 15 years
\n" ); document.write( "Notice that the column with 800's has 15 entries
\n" ); document.write( "The second column from the left has 14 20's
\n" ); document.write( "The third column has 13 20's
\n" ); document.write( "so the amount earned in 15 years is
\n" ); document.write( "15(800) +(14+13+12+11+10+9+8+7+6+5+4+3+2+1)20
\n" ); document.write( "= 15(800) +(105)20
\n" ); document.write( "= 12000 + 2100
\n" ); document.write( "= 14100
\n" ); document.write( "800+
\n" ); document.write( "800+20+
\n" ); document.write( "800+20+20+
\n" ); document.write( "800+20+20+20+
\n" ); document.write( "800+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+ = 1120
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+
\n" ); document.write( "800+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20+20
\n" ); document.write( "Notice that the column with 800's has 22 entries
\n" ); document.write( "The second column from the left has 21 20's
\n" ); document.write( "The third column has 20 20's
\n" ); document.write( "so the amount earned in 22 years is
\n" ); document.write( "22(800) +(21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6)20
\n" ); document.write( "Notice that years 18 through 22 are topped at 1120
\n" ); document.write( "= 22(800) +(216)20
\n" ); document.write( "= 17600 + 4320
\n" ); document.write( "= 21920 for 22 years \n" ); document.write( "
\n" );