A sum doubles in seven years at simple interest. In how many years will the sum become five times the original sum?

A sum doubles in seven years at simple interest. In how many years wil

1.	A sum doubles in seven years at simple interest. In how many years will the sum become five times the original sum?
A.	30
B.	35
C.	21
D.	28
Answer» E.

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A sum doubles in seven years at simple interest. In how many years will the sum become five times the original sum?

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