Asked by Phaby
A man earn a salary of #2500 per annum,if a rise of #500 is given at the end of the year,find
A.the total amount the man will earn in 18years
B.the amount the man will earn in 20years.using arithmetic progression
A.the total amount the man will earn in 18years
B.the amount the man will earn in 20years.using arithmetic progression
Answers
Answered by
Kenny
a=2500
d=500
S18=[n(a+L)]/2
Where L=a+(n-1)d
L=2500+(17×500)
L=2500+8500
L=11000
S20=[17(2500+11000)]/2
S20=17[13500/2]
=17×6750=114750
T20=a+19d
d=500
S18=[n(a+L)]/2
Where L=a+(n-1)d
L=2500+(17×500)
L=2500+8500
L=11000
S20=[17(2500+11000)]/2
S20=17[13500/2]
=17×6750=114750
T20=a+19d
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