Question 1197345
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Hi 
The salary of a clerical officer is #2300 per anum.
A rise of #150 is given at the end of each year. 
Arithmetic sequence:
{{{S[n]=(n(a[1]+a[n]))/2}}}
   {{{a[n]=a[1]+(n-1)*d}}}
   a[12] = 2300 + 11(150) = 3950
{{{S[12]=(12(2300+3950))/2}}} = #37500, the total money earned in 12 years
Using symbol given for money
Wish You the Best in your Studies.
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