Answer:
3/4
Explanation:
3/5(1+p)-21/20
3/5+3/5p=21/20
3/5p=21/20-3/5
3/5p=21/20-12/20
3/5p=9/20
p=9/20รท3/5
p=9/20*5/3
p=45/60
p=3/4
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