If im not mistake i think 1/2 is 0.5 but im not sure about the other one
Answer:
Step-by-step explanation:
12 should be 25% just divide 10 by 40 which gives you .25 then multiply by 100 and that gives you 25%
20 should be 33.33& divide 7 by 21 that gives you .3333 muliply by 100 that gives you 33.33%
21 should be 7.5 since you multiply the percent by the whole to get the part which would be .15 multiply by 50 which is 7.5
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