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Step-by-step explanation:
formula : n = 60a - 900
a=20
n = 60(20) - 900 = 300
a = 25
n = 60(25) - 900 = 600
a = 30
n = 60(30) - 900 = 900
a = 35
n = 60(35) - 900 = 1,200
a = 40
n= 60(40) - 900 = 1,500
a = 50
n = 60(50) - 900 = 2,100