T50 of first-order reaction is 10 min. Starting with 10 mol L-1 rate after 20 min is 

1
0.0693 mol L-1 min-1
2
0.0693 × 2.5 mol L-1 min-1
3
0.0693 × 5 mol L-2 min-1
4
0.0693 × 10 mol L-1 min-1 

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