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.30 = (600p-9000) / 600p

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2 Answers

0.30 = (600p - 9000)/600p
 
0.30 = (600p/600p) - (9000/600p)
 
0.30 = 1 - 15/p
 
-0.7 = -15/p              [Subtracted 1 from both sides]
 
p = (-15)/(-0.7)         [Multiplied both sides by p/(-0.7)]
 
p = 21.43

Comments

0.30*600p = 600p - 900
 180p = 600p-900
600p-180p = 900
420p = 900
p = 900/420
p = 2.14285714*100
P= 21.43
Yeah, I made a simple error.  9000/600p is 15/p not 10.5/p.  I've fixed the error and have the right answer now.  Thanks for catching it!