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Standard VIII
Mathematics
CI
Babubhai borr...
Question
Babubhai borrows Rs.
4000
and agrees to repay with a total interest of Rs.
500
in
10
installations, each instalment being less than the preceding instalment by Rs.
10
. What should be the first and last installment?
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Solution
The installments are in A.P. with difference 10.
Hence,
a
+
a
−
10
+
a
−
20
+
a
−
30
+
.
.
.
.
.
+
a
−
90
=
500
10
(
a
+
a
−
90
)
2
=
500
2
a
−
90
=
100
a
=
95
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