Ratio of the principal and the amount after 1 year is 10:12. Then the rate of in

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Ratio of the principal and the amount after 1 year is 10:12. Then the rate of interest per annum is :

Options:

A . 16%

B . 12%

C . 20%

D . 18%

Answer: Option C
Answer: (c)Using Rule 1,$\text"Principal"/\text"Amount" = 10/12$$\text"Amount"/ \text"Principal" = \text"Principal + interest"/ \text"Principal" = 12/10$1 + $\text"Interest"/ \text"Principal" = 12/10$$\text"Interest"/ \text"Principal" = 2/10 = 1/5$Rate = $1/5$ × 100 = 20%

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