please assist me with this question on my daughters hw, i wish to see the formula along with how you arrived the answer

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The magnitude R . measured on the Richter scale of an earthquake of intensity I is defined as R = 109 . Where lo Is a minimum intensity used nsity of an earthquake was 10 8.36 . 1 . what used for comparison . If the intensity of an earth was the magnitude on the R Richter scale The magnitude of the earthquake was ( Simplify your answer . )Express as a sum of logarithms Choose the correct answer below In ( ad ) A . logo + logd ( B . ( Inc ) ( Ind ) C Inc + Ind ( ) Did ( Inc ) + 0 ( In d )