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R S Aggarwal Quantitative Aptitude

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A certain sum amounts to Rs.  7350 in 2 years  and to Rs.  8575 in 3 years.  Find the sum and rate percent.  

My doubt is that this question can be solved using Simple Interest concept ( i.e by first finding the S. I For 1 year by subtracting the given amount and the find s.i for 2 year.  Then find principal and finally calculate rate percent)  but this is done using CI concept in book whereas it is no where given that it i s si or ci.  How do we recognize if it is si or ci in such problems? 

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