Calculous growth rate problem

Mathematics
Tutor: None Selected Time limit: 1 Day

i am stuck on the following problem. included are pics of the problem. 

http://imgur.com/LaxlhBC   this pic is the graph used to help solve the problem

http://imgur.com/fmyz7WD   this pic is the parts i need answered. 

thanks in advance

Jan 20th, 2015

24pounds

Jan 20th, 2015

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