Question 1181759
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It is quite obvious.


To find the surcharge for each additional pound, divide the difference in charges

$64.55 - $25.80  by the difference in weights  (32 - 7 ) pounds


    the surcharge = {{{(64.55-25.80)/(32-7)}}} = 1.55 dollars per pound.



Next, find the base price for the 1st pound by subtracting 6*1.55 from $25.80 dollars


    the base price = 25.80 - 6*1.55 = 16.50 dollars.
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Solved.