If 60% is $120, then by diving both the percent and the balance by 3, we se that 20% is $40.
Now multiply the 20% and $40 by 2, and you see 40% is $80.
Use cos(t+s)=cos (t)cos (s)- sin(x)sin (1)
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<em>Graph in attachment!</em>
1/5 is written as .2 because .2 x 5 is 1