A sum at the same simple interest becomes amount to Rs. 457 in 5 years and Rs. 574 in 10 years. Find the value of the sum (in Rupees).
A340
B420
C500
D280

A340
B420
C500
D280
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A man invested 75,000 at the rate of % per annum simple interest for 6 years. Find the amount he will receive after 6 years.