Suppose n is used to represent the number.

n = 81/.3 = 270

2/5*270 =

**n - .7n = 81**n = 81/.3 = 270

2/5*270 =

**108**Suppose n is used to represent the number.

** **n - .7n = 81

n = 81/.3 = 270

2/5*270 =**108**

n = 81/.3 = 270

2/5*270 =

X-0.7x=81

1-0.7=(81/x)

x(1-0.7)=81

x=81/(1-0.7)

(2/5)(81/(1-0.7))=108

1-0.7=(81/x)

x(1-0.7)=81

x=81/(1-0.7)

(2/5)(81/(1-0.7))=108

N-70n/100 < 81

100-70n

30n < 8100

n < 8100/30

n=108

100-70n

30n < 8100

n < 8100/30

n=108

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