Step-by-step explanation:

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Answer:

6⅔ %

Step-by-step explanation:

Let the Rate of interest be R.

Principal (P) = Rs.4500

Simple Interest (SI) = Rs.900

Time (T) = 3 years

SI = PRT/100

=> 900 = 4500 × R × 3/100

=> R = 20/3 %

=> Rate = 6⅔ %