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We shall use a table to do this.

 

p           14       p

Q            q       2q

Q2        q2      4q2

 

By proportion

p = kq2

K = p/q2

 

So 

14/q2  = p / 4q2

P = 14× 4 = 56

56/14 ×100% = 400%

400% – 100% = 300% increase.

 

Thus the answer is 300% increase.

 

 

1 Reply 3 Likes

#Khong: Got it. Thanks for correction. Indeed I forgot to minus the original value of p for 300% increase. If all given value (p=14) must be used, then your solution is the one and I have deleted my post.

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