Question

the compound interest of sum in 8 years is rs. 400 and of same sum in 16 years become rs. 1000 find the compound interest on same sum of money in 20 years?

Answer 1

8years=>400
16years=>1000
20years=>?

let the compound interest be x


By cross multiplication
$16 \times x = 20 \times 1000$
16x=20000
x=
$\frac{20000}{16}$
x=1250
The compound interest for 20 years=1250
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Answer 2

8years=>400
16years=>1000
20years=>?
By cross multiplication
the ans is 1450.....