If the simple interest on ₹800 for 4 years and on ₹600 for 2 years combined together is ₹280, then what is the rate of interest per annum?

1
\(7 \frac{3}{11}\%\)
2
\(6 \frac{4}{11}\%\)
3
\(3 \frac{3}{11}\%\)
4
\(5 \frac{3}{11}\%\)

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