You deposit $1000 in an account with an annual interest rate of r (in decimal form) compounded monthly. At the end of 5 years, the balance A is A = 1000  1 +  r 12   60  . Find the rates of change of A with respect to r when  r = 0.09,   r = 0.12,  and  r = 0.15.  (Round your answer to two decimal places.) (a) r = 0.09 $  per 100 percentage points (b) r = 0.12 $  per 100 percentage points (c) r = 0.15  $  per 100 percentage points

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