1.

Find the rate of simple interest per annum, if a sum borrowed becomes double in 5 years.

Answer» Let R% be the rate of interest per annum.
Given that,
Amount (A)`=2 xx` Principal (P)
`therefore P(1+(TR)/(100))=2P`
`implies 1+(5xxR)/(100)=2 implies R=20`
Hence, rate of interest =20% per annum.


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