Answer
(a) $10\%$
(b) $25\%$
(c) $25\%$
(d) $50\%$
Work Step by Step
(a) This is roughly 40 out of 400, equals to 10 out of 100 $=10\%$
(b) This is roughly 100 out of 400, equals to 25 out of 100 $=25\%$
(c) This is roughly 50 out of 200, equals to 25 out of 100 $=25\%$
(d) This is roughly 100 out of 200, equals to 50 out of 100 $=50\%$