Answer:11/20
Explanation:
Don: 1/4 of $300 = 300x.25 = $75
Ron:1/5 of $300 = 300x.20 = $60
75 + 60 = $135
300-135 = $165
165/300 = .55 = 55% = 55/100 = 11/20
OR
take 1/4 and 1/5 and make denominators equal
D: 5/20 and R: 4/20 = D+R:9/20 so C:11/20
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