A certain sum becomes Rs 840 in 3 years and Rs 1200 in 7 years at simple interest. What is the value (in Rs.) of principal?

A certain sum becomes Rs 840 in 3 years and Rs 1200 in 7 years at simp

1.	A certain sum becomes Rs 840 in 3 years and Rs 1200 in 7 years at simple interest. What is the value (in Rs.) of principal?
A.	520
B.	570
C.	620
D.	670
Answer» C. 620

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A certain sum becomes Rs 840 in 3 years and Rs 1200 in 7 years at simple interest. What is the value (in Rs.) of principal?

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