solve for p

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**

solve for p

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Olney, MD

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)]

Waltham, MA

0.30*600p = 600p-9000

180p = 600p-9000

600p-180p = 9000

420p = 9000

p = 9000/420

p = 2.1485714

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