a man agree to payoff a debt of 3600 by 40 annual installment which from in a. p. when 30 of the installments are paid he dies leaving 1/3 of the debt unpaid find the value of the first
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MATHS
A man arranges to pay off a debt of RS. 3600 by 40 annual installments which form an arithmetic series. When 30 of the installments are paid, he dies leaving one-third of the debt unpaid, find the value of the first installment.
November 22, 2019avatar
Bipin Bhandari
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ANSWER
According to the question,
Tthe total amount of debit to be paid in 40 installment = Rs 3600
After 30 installment one-third of his debit is left unpaid. This means that he paid two third of the payment. So,
The amount he paid in 30 installments =
3
2
(3600)
= 2(1200)
= 2400
Let us take the first installment as a and common difference as d.
So, using the formula for the sum of n terms of an A.p,
s
n
=
2
n
[2a+(n−1)d]
Let us find a and d, for 30 installments.
s
30
=
2
30
[2a+(30−1)d]
2400=15[2a+(29)d]
15
2400
=2a+29d
160=2a+29d
a=
2
160−29d
.....(1)
Similarly, we find a and d for 40 installment.
s
40
=
2
40
[2a+(40−1)d]
3600=20(2a+(39)d)
20
3600
=2a+39d
a=
2
180−39d
subtracting (1) from (2), we get
a−a=(
2
180−39d
)−(
2
160−29d
)
0=
2
180−39d−160+29d
.....(2)
0=20−10d
Further solving for d
10d = 20
d=
10
20
d = 2 the value
subtracting the value of d in (1), we get,
a=
2
160−29(2)
=
2
160−58
=
2
102
= Rs 51
ANSWER
According to the question,
Tthe total amount of debit to be paid in 40 installment = Rs 3600
After 30 installment one-third of his debit is left unpaid. This means that he paid two third of the payment. So,
The amount he paid in 30 installments =
3
2
(3600)
= 2(1200)
= 2400
Let us take the first installment as a and common difference as d.
So, using the formula for the sum of n terms of an A.p,
s
n
=
2
n
[2a+(n−1)d]
Let us find a and d, for 30 installments.
s
30
=
2
30
[2a+(30−1)d]
2400=15[2a+(29)d]
15
2400
=2a+29d
160=2a+29d
a=
2
160−29d
.....(1)
Similarly, we find a and d for 40 installment.
s
40
=
2
40
[2a+(40−1)d]
3600=20(2a+(39)d)
20
3600
=2a+39d
a=
2
180−39d
subtracting (1) from (2), we get
a−a=(
2
180−39d
)−(
2
160−29d
)
0=
2
180−39d−160+29d
.....(2)
0=20−10d
Further solving for d
10d = 20
d=
10
20
d = 2 the value
subtracting the value of d in (1), we get,
a=
2
160−29(2)
=
2
160−58
=
2
102
= Rs 51
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