1.

The ratio of the principal and the amount (principal along with interest) in `1` year is `8:9` , the rate of simple interest per annum is __________.

Answer» `12(1)/(2)%` , since let principal `=Rs8x` and amount `=Rs9x`
`:. ` Interest `=Rs(9x-8x)=Rsx`.
`:.` Simple interest per annum `=(x)/(8x)xx100%=(25)/(2)%=12(1)/(2)%`


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