At simple interest, a sum doubles after 20 years. The rate of interest per annum is ...
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The rate of interest per annum is 5% .
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Step-by-step explanation:
as the sum doubles itself
two equation will be formed
in first equation the principal will be let 100 and T will be 1
in second the principal will bcm double means 200 and T will be 20
by solving both equation u will find
rate=40p/a
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